| Idiom | Meaning | Example | 
| not a question of | 
(See it's not a question of)
 | 
 | 
| not all it's cracked up... | 
(See all it's cracked up to be)
 | 
 | 
| not all there | 
retarded, slow to learn, one brick short...
 | 
Sometimes Vincent acts kind of strange - like he's not all there.
 | 
| not at all | 
it was no trouble at all,  don't mention it, no prob
 | 
"Thank you for helping us find our dog," Dad said. "Not at all," the man replied.
 | 
| not by a long shot | 
very little chance, not likely
 | 
That horse won't win, not by a long shot. It's old and slow.
 | 
| not by any stretch of the imagination | 
not adding to the story, not stretching it
 | 
Gigi wasn't his only girl, not by any stretch of the imagination.
 | 
| not feeling myself | 
not feeling well, under the weather
 | 
I'm not feeling myself these days. I'm tired all the time.
 | 
| not for all the tea in China | 
no; never; not if you gave me all the tea in China
 | 
"Would you like to live in space?" "No. Not for all the tea in China!"
 | 
| not half bad | 
quite good, better than expected
 | 
Have you seen Honey, I Ate The Kids? It's not half bad, actually.
 | 
| not likely | 
very little chance, improbable, a slim chance
 | 
"Do you think we'll win the prize?" the boy asked. "Not likely," his dad replied.
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