- An informal way of saying I cannot do that, It's not possible, or I am unable to comply.
Explanation
Origin
- Often attributed to Chinese Pidgin English from the 19th century, mimicking sentence structures where ability/modality might precede the verb (can do, no can do).
- It entered general English as a colloquial, sometimes slightly humorous or folksy, expression of inability.
Synonyms & Related Expressions
Alternatives
Slang/Informal:
- That's a no-go.
- Ain't happening. / Not gonna happen.
- Forget it. / Forget about it.
- Nope, can't swing it.
Vulgar/Emphatic (Strong refusal/impossibility):
- No fucking way.
- Not a chance in hell.
- Absolutely fucking not.
Milder/Standard:
- Sorry, I can't do that.
- Unfortunately, that's not possible.
- I'm unable to assist with that. (Formal)
Situational Appropriateness
- Informal.
- Best suited for casual conversations with friends, family, or sometimes familiar colleagues.
- Avoid in formal settings; it can sound unprofessional, overly casual, or even slightly uneducated depending on the context and listener. I'm unable to or That's not possible are better formal choices.
Misunderstanding Warnings
- The non-standard grammar (No can do vs. I cannot do) might initially confuse learners.
- However, the meaning cannot is usually easily inferred from context.
Examples
- Can you fix my computer by lunchtime? Sorry, too many repairs ahead of you. No can do.
- Hey, can I borrow your car this weekend? Wish I could help, pal, but no can do. I need it.
- Can we get this report done a day early? With the current workload? No can do.
Dialogue
Kid: Dad, can you build me a treehouse this afternoon?
Dad: (Looking at a long list of chores) Haha, I wish! No can do today, sport. Maybe we can plan it for next month?
Kid: Aww, okay.
Social Media Examples
- Replying to a request in a hobby group: Can someone 3D print this obscure part for me? -> Checked my filament stock, sorry, no can do on that color right now.
- Casual chat: Can you grab pizza on your way home? -> Ah! Traffic is insane. No can do, gonna be late as it is.
Response Patterns
- The requester usually accepts the informal refusal.
- Ah, okay. / Gotcha. / Alright, thanks anyway.
- That's a shame.
- They might ask for a reason if one isn't given.
Common Follow-up Questions/Actions
After the refusal:
- The requester might ask Why not? or seek another way to achieve their goal.
- The refuser might optionally offer a brief explanation.
Action:
- The request is understood as unfulfillable by this person/in this way.
Conversation Starter
- No.
- It's a response indicating inability or impossibility.
Intonation
- Casual, often definitive.
- Can sound apologetic (Sorry, NO can DO.) or firm/final.
- Stress often on No and do.
Generation Differences
- Understood by most generations.
- Might feel slightly dated or be used more frequently by older generations, but still persists in general informal use.
Regional Variations
- Widely understood across major English-speaking regions, though perhaps felt to be characteristically American English by some.