Afraid not vs No vs Not really

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

Afraid not

InformalBeyond 10,000 (less common)

No

High-frequency chunkA1exclamation

Not really

InformalTop 2,000 (common)
Most formal: NoMost common: No
 Afraid notNoNot really
Pronunciation🇬🇧 //əˈfreɪd nɒt//🇺🇸 //əˈfreɪd nɑt//🇬🇧 /["/nəʊ/"]/🇺🇸 /["/nəʊ/"]/🇬🇧 //nɒt ˈrɪəli//🇺🇸 //nɑt ˈrɪəli//
MeaningMeaning you disagree or refuse what was said.Refusal or disagreement.Not true or correct.
ExampleCan you help me with my homework?I asked if she wanted to join us, and she said no.When he said he was an expert, I thought, 'Not really'.
RegisterInformalNeutralInformal
How commonBeyond 10,000 (less common)High-frequency chunkTop 2,000 (common)
CEFR level-A1-
Part of speechexclamation
Collocationsafraid not, not really, unfortunately notsay no, no way, no doubt, no problem, no harmnot really my thing, not really sure, not really interested
Antonyms-yes-
Common mistakesConfused with 'I'm afraid' which is a more polite way to decline., Used in overly formal contexts where it sounds inappropriate., Misunderstood as a direct refusal without considering tone.Confused with 'not', using 'no' in places where 'not' should be used., Inappropriately using 'no' when a softer response is better., Mispronouncing it in a way that sounds like 'know'.Using it in very formal writing or speeches., Confusing with 'not really' as a definitive answer instead of an expression of doubt.
Usage notesUsed mainly in casual conversation to gently say 'no'. Avoid in formal situations.Use 'no' to reject something or indicate disagreement. It's appropriate in both formal and informal contexts. Avoid using it abruptly in sensitive situations to avoid coming off as rude.Used to express disagreement or doubt. Common in casual conversations, but may be too informal for formal settings.

See it in real clips

Afraid not
Not really

Frequently asked questions: Afraid not vs No vs Not really

What's the difference between Afraid not, No, and Not really?

Afraid not: Meaning you disagree or refuse what was said. No: Refusal or disagreement. Not really: Not true or correct.

Which is more formal: Afraid not, No, and Not really?

No is the most formal of these.

Which is more common: Afraid not, No, and Not really?

No is the most common in everyday English.

Can you show an example of each?

Afraid not: Can you help me with my homework? No: I asked if she wanted to join us, and she said no. Not really: When he said he was an expert, I thought, 'Not really'.

Can I use Afraid not, No, and Not really interchangeably?

Not always. Afraid not, No, and Not really 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.