Synonyms for Unintentionally:

• adj.

  •accidentally (adjective)
  • by mistake.

• adv

  •by chance (adverb)
  • as luck would have it,
  • out of the clear blue sky,
  • by coincidence,
  • by a fluke.
  •unawares (adverb)
  • surprisingly,
  • off guard,
  • by surprise,
  • unready.

• adv.

  •accidentally (adverb)
  • fortunately,
  • fatally,
  • fortuitously,
  • aimlessly,
  • randomly,
  • haphazardly,
  • adventitiously,
  • luckily,
  • causelessly.
  •all (adverb)
  • unintentionally.
  •by chance (adverb)
  • for some reason.
  •not done on purpose (adverb)
  • involuntarily,
  • incidentally.

• n.

  •
  • without design,
  • casually.

• Other synonyms:

  •abstractedly
  • unconsciously.
  •Other relevant words:
  • mistakenly,
  • recklessly,
  • unpredictably,
  • chance,
  • unintentional,
  • unknowingly,
  • instinctively,
  • involuntary,
  • unforeseeably,
  • spontaneously,
  • subconsciously,
  • circumstantially,
  • playfully,
  • compulsively,
  • carelessly,
  • wantonly,
  • ignorantly,
  • Unpremeditatedly,
  • unexpectedly,
  • subliminally,
  • intuitively,
  • coincidentally,
  • purposelessly,
  • reflexly,
  • Undesignedly.

Paraphrases for Unintentionally:

• Equivalence

  • Adverb
    unwittingly, inadvertently, involuntarily.

• Independent

  • Adverb
    unconsciously, unwillingly, incidentally.

• Other Related

  • Adverb
    accidentally.

Antonyms for Unintentionally:

• adv.

  • all
    intentionally, deliberately.
  • not done on purpose
    by design, purposely, on purpose.
  • Other antonyms:
    advisedly, designedly, by choice.