|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.
||very little chance, improbable, a slim chance
||"Do you think we'll win the prize?" the boy asked. "Not likely," his dad replied.