You don't really mean vs You're not serious

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

You don't really mean

Beyond 10,000 (less common)

You're not serious

 You don't really meanYou're not serious
Pronunciation🇬🇧 //juː dəʊnt ˈrɪəli miːn//🇺🇸 //ju doʊnt ˈrɪəli min//
Meaningyou don't actually feel that way
ExampleWhen you said that, I thought, 'you don't really mean it.'-
RegisterNeutral-
How commonBeyond 10,000 (less common)-
Collocationsyou don't really mean that, I know you don't really mean, it’s clear you don’t really mean-
AntonymsYou genuinely mean, You sincerely mean, You truly mean-
Common mistakesConfusing with 'you don't truly mean', Using in overly formal contexts, Misplacing emphasis in conversation-
Usage notesUsed when someone says something but may not truly believe it. Common in conversations where feelings are questioned.-

See it in real clips

You don't really mean
You're not serious

Frequently asked questions: You don't really mean vs You're not serious

What's the difference between You don't really mean and You're not serious?

You don't really mean: you don't actually feel that way You're not serious:

Can I use You don't really mean and You're not serious interchangeably?

Not always. You don't really mean and You're not serious 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.