Definition of "not really"

not really

adverb
not comparable
1. To a low degree, not particularly, not especially.
  Quotations
  I asked him if it had been a hard fight."Not really," he said.
  2022 September 13, 2:54 from the start, in See what Russians left behind after being run out of city‎, CNN
2. Not actually (a hypothetical will not, in fact, come to pass), often rhetorical.