Idioms are colorful phrases whose meanings go beyond the literal words. They add flair to language, help convey ideas with nuance, and make conversations more engaging.
Some idioms capture hope, excitement, or inevitability, while others emphasize impossibility.
Idioms that express “never going to happen” are especially useful in daily speech because they allow speakers to communicate skepticism, disbelief, or humor without sounding harsh.
Using these idioms can make your English more natural and expressive, whether you’re chatting with friends, writing an essay, or giving a presentation.
Knowing when and how to use them can also improve your comprehension of movies, books, or news articles where figurative language is common.
This guide covers 15 idioms for never going to happen, complete with meanings, usage tips, and examples, making it perfect for learners, writers, and professionals looking to elevate their English fluency in 2026.
Secondary keywords naturally included: English idioms, impossible situations, figurative language.
Quick Overview Table
| Idiom | Short Meaning | Tone (Formal/Informal) | Common Use Context |
|---|---|---|---|
| When pigs fly | Something impossible | Informal | Casual conversations, jokes |
| Not in a million years | Extremely unlikely | Informal | Exaggeration in speech |
| Snowball’s chance in hell | Virtually impossible | Informal | Emphasizing difficulty |
| Pie in the sky | Unrealistic hope | Formal/Informal | Critiquing unrealistic plans |
| Fat chance | Slim/no possibility | Informal | Sarcastic response |
| Castles in the air | Unrealistic dreams | Formal | Writing, literature |
| Beyond the pale | Totally unacceptable/impossible | Formal | Professional criticism |
| Out of the question | Cannot happen | Formal/Informal | Workplace or negotiation |
| When hell freezes over | Never | Informal | Dramatic, humorous emphasis |
| No dice | Refusal or impossibility | Informal | Everyday speech, casual tone |
| Dead in the water | Hopeless, doomed | Formal/Informal | Business or project failure |
| Not on your life | Absolutely not | Informal | Strong refusal |
| Like finding a needle in a haystack | Almost impossible | Formal/Informal | Problem-solving contexts |
| Blue moon | Extremely rare | Informal | Time, event references |
| Water off a duck’s back | Impossible to affect/change | Informal | Emotional resilience, figurative |
Detailed Idioms Section
When Pigs Fly
Meaning: Something that is completely impossible or absurd.
When to Use It: Use to express disbelief in a humorous or exaggerated way.
Example Sentence: “You think John will start exercising daily? Yeah, when pigs fly!”
Similar Expressions: “Not in a million years,” “Fat chance”
Opposite Expression: “It’s a sure thing”
Not in a Million Years
Meaning: Extremely unlikely to happen.
When to Use It: Emphasize that an event will almost certainly never occur.
Example Sentence: “I would never forgive her for that, not in a million years.”
Similar Expressions: “When hell freezes over,” “No way”
Opposite Expression: “Any day now”
Snowball’s Chance in Hell
Meaning: A situation with virtually zero chance of success.
When to Use It: Highlight extreme unlikelihood in informal speech.
Example Sentence: “He has a snowball’s chance in hell of winning the election.”
Similar Expressions: “Fat chance,” “Not on your life”
Opposite Expression: “Highly probable”
Pie in the Sky
Meaning: An unrealistic or fanciful hope or plan.
When to Use It: Critique ideas that are impractical.
Example Sentence: “Their proposal to double profits in a month is just pie in the sky.”
Similar Expressions: “Castles in the air,” “Chasing rainbows”
Opposite Expression: “Practical solution”
Fat Chance
Meaning: Very little or no possibility; often sarcastic.
When to Use It: Responding to an idea you think will not happen.
Example Sentence: “Fat chance he’ll apologize for that!”
Similar Expressions: “No way,” “Not on your life”
Opposite Expression: “Sure thing”
Castles in the Air
Meaning: Daydreams or plans with no practical chance of happening.
When to Use It: Used in writing or formal discussion about unrealistic ideas.
Example Sentence: “Most of his business plans were castles in the air.”
Similar Expressions: “Pie in the sky,” “Wishful thinking”
Opposite Expression: “Concrete plan”
Beyond the Pale
Meaning: Completely unacceptable or impossible.
When to Use It: Critique actions, behaviors, or proposals in a professional context.
Example Sentence: “Expecting a 50% budget cut overnight is beyond the pale.”
Similar Expressions: “Out of the question,” “Unthinkable”
Opposite Expression: “Reasonable request”
Out of the Question
Meaning: Absolutely cannot happen.
When to Use It: Use in both formal and informal settings to reject something firmly.
Example Sentence: “Skipping the mandatory meeting is out of the question.”
Similar Expressions: “No dice,” “Beyond the pale”
Opposite Expression: “On the table”
When Hell Freezes Over
Meaning: Will never happen.
When to Use It: Dramatic and humorous way to emphasize impossibility.
Example Sentence: “I’ll lend him money when hell freezes over.”
Similar Expressions: “Not in a million years,” “No way”
Opposite Expression: “Any time soon”
No Dice
Meaning: Denial or impossibility; cannot happen.
When to Use It: Casual, informal refusal.
Example Sentence: “Can I borrow your car tonight?” – “No dice.”
Similar Expressions: “Fat chance,” “Out of the question”
Opposite Expression: “Sure”
Dead in the Water
Meaning: Completely hopeless or without chance.
When to Use It: Often used for projects, plans, or initiatives.
Example Sentence: “Without funding, the startup was dead in the water.”
Similar Expressions: “Snowball’s chance in hell,” “Doomed”
Opposite Expression: “On track”
Not on Your Life
Meaning: Absolutely not going to happen.
When to Use It: Strong refusal or denial in casual speech.
Example Sentence: “Not on your life am I going skydiving!”
Similar Expressions: “Fat chance,” “No way”
Opposite Expression: “Definitely”
Like Finding a Needle in a Haystack
Meaning: Extremely difficult or nearly impossible.
When to Use It: Used when something is very hard to locate or achieve.
Example Sentence: “Locating the lost files was like finding a needle in a haystack.”
Similar Expressions: “Almost impossible,” “Next to impossible”
Opposite Expression: “Easily done”
Blue Moon
Meaning: Very rare; unlikely to happen.
When to Use It: Describe rare events or circumstances.
Example Sentence: “He only visits us once in a blue moon.”
Similar Expressions: “Once in a lifetime,” “Rare as hen’s teeth”
Opposite Expression: “Frequently”
Water Off a Duck’s Back
Meaning: Impossible to affect or change someone’s mind/behavior.
When to Use It: Refers to situations where efforts to influence are ineffective.
Example Sentence: “Criticism is water off a duck’s back for her.”
Similar Expressions: “Roll off one’s back,” “Unshakeable”
Opposite Expression: “Deeply affected”
Categorize the Idioms
Idioms for Positive Situations
- Blue Moon (rare, exciting events)
- Water Off a Duck’s Back (resilient situations)
Idioms for Difficult Situations
- Snowball’s Chance in Hell
- Dead in the Water
- Like Finding a Needle in a Haystack
Funny/Informal Idioms
- When Pigs Fly
- Fat Chance
- No Dice
- Not on Your Life
Formal/Professional Idioms
- Out of the Question
- Beyond the Pale
- Pie in the Sky
- Castles in the Air
How to Use These Idioms in Real Conversations
Workplace Example: “Expecting the client to approve this budget in a day? That’s pie in the sky.”
Casual Conversation Example: “You think I’ll lend him my car? Fat chance!”
Writing Example: “Her ideas, though creative, were mostly castles in the air and lacked feasibility.”
IELTS/Exam Tip: Using idioms like “not in a million years” or “pie in the sky” can demonstrate natural English usage and boost your speaking or writing scores—but ensure they fit the tone.
Common Mistakes to Avoid
- Literal misunderstanding: Idioms like “when pigs fly” are not about animals.
- Wrong tone usage: Some idioms are informal (fat chance) while others suit formal writing (pie in the sky).
- Mixing formal vs informal: Avoid using informal idioms in professional emails unless humor is acceptable.
Practice Exercises
Fill-in-the-Blank (10)
- I’ll forgive him ______. (not in a million years)
- Winning the lottery is like ______. (finding a needle in a haystack)
- Expecting him to arrive on time is ______. (pie in the sky)
- Her proposal was ______. (castles in the air)
- Can we skip the safety rules? ______. (out of the question)
- He only visits once in a ______. (blue moon)
- Asking for a raise now? ______. (no dice)
- Criticism is ______ for her. (water off a duck’s back)
- That project is ______ without funding. (dead in the water)
- He’ll start dieting? Yeah, ______. (when pigs fly)
Multiple Choice (5)
- Which idiom means “extremely unlikely”?
a) Blue Moon
b) Snowball’s Chance in Hell ✅
c) Water Off a Duck’s Back
d) Pie in the Sky - Which idiom is informal and humorous?
a) Beyond the Pale
b) Not on Your Life ✅
c) Castles in the Air
d) Out of the Question - Which idiom suits formal writing about unrealistic plans?
a) Fat Chance
b) Castles in the Air ✅
c) No Dice
d) When Pigs Fly - “Criticism doesn’t bother her at all” = ?
a) Dead in the Water
b) Water Off a Duck’s Back ✅
c) Blue Moon
d) Fat Chance - “Impossible to locate something” = ?
a) Pie in the Sky
b) Like Finding a Needle in a Haystack ✅
c) Not in a Million Years
d) No Dice
Short Writing Prompts (3)
- Describe a time when something you wanted seemed impossible using an idiom.
- Write a workplace email politely rejecting an unrealistic request using one idiom.
- Create a funny social media post using an idiom about something that will never happen.
Answer Key: See context above for fill-in-the-blank and multiple choice solutions.
FAQs
What does “when pigs fly” mean?
It refers to something that will never happen, usually said humorously.
How is “pie in the sky” different from “castles in the air”?
Both describe unrealistic ideas, but “pie in the sky” often critiques hope, while “castles in the air” emphasizes impractical planning.
Can I use these idioms in formal writing?
Some are formal (pie in the sky, beyond the pale), while others are informal and conversational. Tone matters.
Which idiom shows extreme improbability in casual speech?
“Fat chance,” “not in a million years,” and “no dice” are informal ways to express this.
How can idioms improve my English fluency?
Using idioms naturally shows command of figurative language, adds nuance, and makes your speech or writing more expressive.
Conclusion
Mastering idioms for “never going to happen” enhances your English fluency and confidence.
These phrases allow you to express impossibility with humor, emphasis, or professionalism depending on the situation.
By practicing these idioms in conversation, writing, and exams, you gain a richer, more natural command of the language.
Remember, learning idioms in context—rather than memorizing definitions—makes them easier to recall and use naturally.
Corvin Hale is a language enthusiast who makes learning English idioms simple and fun.
