I’m not that stupid!

not the slightest reason

not half as much

to not half do something

to be not up to the mark

It’s not worth worrying about

to not have a bean

I'm not tired anymore.

not if I can help it

to not have a foot/leg to stand on

Not a chance!

not in the right ballpark

to not have a hope in hell

It’s not worth the effort [involved]

It is not in her character to follow the men

not likely

I’m not able to commit to that right now.

I'm not an artist.

to not have a leg to stand on

It is not done

I am not an early riser.

not much cop

to not have a penny to one’s name

not never, not nohow

I’m not standing for this