Synonyms for Spontaneously:

• adj.

  •freely (adjective)
  • at one's discretion,
  • purposely,
  • of one's own accord,
  • without urging,
  • frankly,
  • at will,
  • advisedly,
  • as you please,
  • at discretion,
  • candidly,
  • without hindrance,
  • deliberately,
  • without prompting,
  • unchallenged,
  • fancy-free,
  • unreservedly,
  • plainly,
  • openly,
  • of one's own free will,
  • without reserve,
  • designedly,
  • at one's pleasure,
  • more advisedly,
  • at pleasure,
  • without restraint,
  • of one accord,
  • more willingly,
  • intentionally,
  • of own accord.

• a. & adv.

  •ad libitum (adjective, adverb)
  • impulsive,
  • improvised,
  • according to pleasure,
  • as one wishes,
  • made-up,
  • offhand,
  • off-the-cuff,
  • as one thinks best,
  • unrehearsed,
  • extemporaneous.

• adv

  •ad-lib (adverb)
  • ADLIB,
  • off top of head.
  •extemporaneously (adverb)
  • on spur of moment,
  • on spur of the moment.

• adv.

  •ad-lib (adverb)
  • spontaneously,
  • off the cuff,
  • off the top of one's head,
  • without rehearsal,
  • without preparation,
  • extempore,
  • off the top of head.
  •ad libitum (adverb)
  • as thinks best,
  • madeup,
  • un-rehearsed,
  • as wishes.
  •extemporaneously (adverb)
  • haphazardly,
  • improvisationally.
  •impulsively (adverb)
  • hastily,
  • abruptly,
  • rashly,
  • reflexively,
  • impulsively.
  •instantly (adverb)
  • now,
  • without delay,
  • pronto,
  • in a flash,
  • right,
  • on a dime,
  • right away,
  • PDQ,
  • forthwith,
  • first off,
  • tout de suite,
  • away.
  •naturally (adverb)
  • casually,
  • genuinely,
  • consistently,
  • habitually,
  • easily,
  • commonly,
  • simply,
  • instinctively,
  • typically,
  • normally,
  • generally,
  • readily,
  • innocently,
  • uniformly,
  • ordinarily,
  • customarily,
  • usually,
  • unaffectedly.
  •voluntarily (adverb)
  • with all one's heart.

• n.

  •
  • automatically,
  • unconsciously,
  • directly.
  •
  • willing.
  •impromptu (noun)
  • impromptu.
  •off the cuff (noun)
  • cuff.

• Other synonyms:

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

Paraphrases for Spontaneously:

• Independent

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

• Other Related

  • Adverb
    voluntarily.