Maybe not vs Not really vs Perhaps not

When to use each in English, with meaning, register, and examples.

Maybe not

InformalTop 2,000 (common)

Not really

InformalTop 2,000 (common)

Perhaps not

Top 2,000 (common)
Most formal: Perhaps not
 Maybe notNot reallyPerhaps not
Pronunciation🇬🇧 //ˈmeɪbi nɒt//🇺🇸 //ˈmeɪbi nɑt//🇬🇧 //nɒt ˈrɪəli//🇺🇸 //nɑt ˈrɪəli//🇬🇧 //pəˈhæps nɒt//🇺🇸 //pərˈhæps nɑt//
MeaningA way to express doubt or uncertainty about something.Not true or correct.Maybe not
ExampleDo you think we should go to the party?When he said he was an expert, I thought, 'Not really'.I thought about joining the team, but **perhaps not**.
RegisterInformalInformalNeutral
How commonTop 2,000 (common)Top 2,000 (common)Top 2,000 (common)
Collocationsthink maybe not, say maybe not, consider maybe notnot really my thing, not really sure, not really interestedsuggest that perhaps not, feel that perhaps not, think that perhaps not
Common mistakesUsing in formal writing where a stronger phrase is needed., Confusing with 'maybe' which indicates possibility without disagreement., Overusing in conversations, making replies sound indecisive.Using it in very formal writing or speeches., Confusing with 'not really' as a definitive answer instead of an expression of doubt.Using in overly formal contexts., Confusing with 'maybe' which is less definite., Assuming it expresses strong disagreement.
Usage notesUse 'maybe not' when you're unsure or want to softly disagree. It's casual and often used in conversation.Used to express disagreement or doubt. Common in casual conversations, but may be too informal for formal settings.Used to express uncertainty about a situation or idea. More polite than simply saying 'no'.

See it in real clips

Maybe not
Not really
Perhaps not

Frequently asked questions: Maybe not vs Not really vs Perhaps not

What's the difference between Maybe not, Not really, and Perhaps not?

Maybe not: A way to express doubt or uncertainty about something. Not really: Not true or correct. Perhaps not: Maybe not

Which is more formal: Maybe not, Not really, and Perhaps not?

Perhaps not is the most formal of these.

Can you show an example of each?

Maybe not: Do you think we should go to the party? Not really: When he said he was an expert, I thought, 'Not really'. Perhaps not: I thought about joining the team, but **perhaps not**.

Can I use Maybe not, Not really, and Perhaps not interchangeably?

Not always. Maybe not, Not really, and Perhaps not are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.