Synonyms for Not a bit:

• adv.

  •hardly (adverb)
  • perceptibly,
  • only just,
  • gradually,
  • rarely,
  • imperceptibly,
  • little,
  • not likely,
  • not noticeably,
  • no way,
  • faintly,
  • with trouble,
  • not by much,
  • not notably,
  • somewhat,
  • Scantly,
  • slightly,
  • detectably,
  • sparsely,
  • not measurably,
  • no more than,
  • not often,
  • comparatively,
  • not at all,
  • sporadically,
  • not markedly,
  • almost not,
  • infrequently,
  • by a hair,
  • simply,
  • just,
  • only,
  • once in a blue moon,
  • not much,
  • barely,
  • almost inconceivably,
  • by no means,
  • seldom,
  • pretty near,
  • practically,
  • not quite.

• adv

  •hardly (adverb)
  • once in blue moon.

• pron.

  •none (pronoun)
  • nothing,
  • nil,
  • no one,
  • zero,
  • zilch,
  • nobody.

• Other synonyms:

  •
  • nohow,
  • nowise.
  •Other relevant words:
  • not,
  • Noway,
  • not a jot,
  • under no circumstances,
  • never,
  • in no case,
  • not in the least,
  • Noways,
  • on no account,
  • in no wise,
  • negative,
  • nay,
  • in no respect,
  • at no hand.

Antonyms for Not a bit:

• adv.

  • hardly
    frequently, very.

• pron.

  • none
    some.