Definition for Spontaneously:

• without advance preparation; " he spoke ad lib"

Synonyms for Spontaneously:

• adj.

  •freely (adjective)
  • intentionally,
  • openly,
  • without prompting,
  • of own accord,
  • purposely,
  • deliberately,
  • of one's own accord.

• adv.

  •extemporaneously (adverb)
  • haphazardly,
  • improvisationally.
  •impulsively (adverb)
  • hastily,
  • abruptly,
  • rashly,
  • reflexively,
  • impulsively.
  •naturally (adverb)
  • easily,
  • casually,
  • readily,
  • unaffectedly,
  • instinctively.

• n.

  •
  • automatically,
  • immediately,
  • unconsciously,
  • directly.
  •
  • willing.

• Other synonyms:

  •
  • willfully.
  •
  • willingly.
  •Other relevant words:
  • gratuitously,
  • unexpectedly,
  • offhandedly,
  • desolately,
  • naively,
  • unthinkingly,
  • orally,
  • hurriedly,
  • chaotically,
  • independently,
  • impetuously,
  • savagely,
  • involuntarily,
  • Unconstrainedly,
  • helter-skelter,
  • liberally,
  • impromptu,
  • recklessly,
  • on purpose,
  • precipitately,
  • Natively,
  • tempestuously,
  • wildly,
  • of itself,
  • by chance,
  • furiously,
  • slap-bang,
  • barbarically,
  • spontaneous,
  • by oneself,
  • violently,
  • extemporarily,
  • angrily,
  • pell-mell,
  • suddenly,
  • incautiously,
  • mechanically,
  • confusedly,
  • with one accord,
  • blindly,
  • feverishly,
  • innately,
  • accidentally,
  • gratis,
  • unrestrainedly,
  • naturally,
  • unintentionally,
  • slapdash.

Paraphrases for Spontaneously:

• Independent

  • Adverb
    automatically, willingly, naturally, readily, freely, immediately, proactively, concurrently.

• Other Related

  • Adverb
    voluntarily.