Synonyms for Extemporaneous:

• adj.

  •ad-lib (adjective)
  • at will,
  • made up,
  • without restraint,
  • ADLIB,
  • as one thinks best,
  • as one wishes.
  •casual (adjective)
  • in frequent,
  • most serendipitous,
  • un-foreseen,
  • un expected,
  • un planned,
  • un foreseen,
  • irregular,
  • in-frequent,
  • offhand,
  • more serendipitous,
  • un-expected,
  • un-planned.
  •impromptu (adjective)
  • more improviso,
  • more unscripted,
  • more faked,
  • most vamped,
  • most unscripted,
  • more improv,
  • most improv,
  • most faked,
  • more vamped,
  • un-scripted,
  • shot from hip.
  •improvised (adjective)
  • free,
  • makeshift,
  • on-the-spot,
  • fake,
  • jamming,
  • ad hoc,
  • toss off,
  • made-up,
  • automatic,
  • toss out,
  • unplanned,
  • by ear,
  • expedient,
  • Improvisatory,
  • on impulse,
  • winging it,
  • immediate,
  • informal.
  •impulsive (adjective)
  • ill-considered,
  • rash,
  • hot and cold,
  • reflexive,
  • Unmeditated,
  • unprompted,
  • abrupt,
  • improvised,
  • hasty,
  • instantaneous,
  • gone off deep end,
  • hot-and-cold.
  •off the cuff (adjective)
  • off-hand.
  •rough-and-ready (adjective)
  • more wild and woolly,
  • more wild-and-woolly,
  • jerrybuilt,
  • un refined,
  • rough and ready,
  • jerry built,
  • pro visional,
  • most wild-and-woolly,
  • most wild and woolly,
  • wild and woolly,
  • un-refined.
  •spontaneous (adjective)
  • more unpremediated,
  • from hip,
  • un artful,
  • un-artful,
  • un forced,
  • un-forced,
  • un-bidden,
  • un-conscious,
  • most unbidden,
  • in evitable,
  • more uncontrived,
  • un bidden,
  • un sophisticated,
  • off top head,
  • un-avoidable,
  • un-controlled,
  • un-compelled,
  • more unbidden,
  • more unartful,
  • un compelled,
  • un avoidable,
  • un contrived,
  • un conscious,
  • most unartful,
  • most uncontrived,
  • in-evitable,
  • un-contrived,
  • un constrained,
  • un controlled,
  • most unpremediated.
  •undevised (adjective)
  • un devised,
  • un-devised.
  •unintended (adjective)
  • un intended,
  • un-intended.
  •unintentional (adjective)
  • un intentional,
  • un-intentional.
  •unintentional/unintended (adjective)
  • in-advertent,
  • more unthought,
  • unthought,
  • un-thinking,
  • un witting,
  • in advertent,
  • un thought,
  • un thinking,
  • most unthought,
  • un-witting,
  • un-thought.
  •unmeant (adjective)
  • un meant,
  • un-meant.
  •unpremeditated (adjective)
  • un premeditated,
  • un-premeditated.
  •unprepared (adjective)
  • haphazard.
  •unrehearsed (adjective)
  • off the top one head,
  • off the top of head,
  • off top of one's head,
  • spur the moment,
  • spur of moment,
  • off the top head,
  • off top of one head,
  • off top one head,
  • spur of the moment,
  • un-rehearsed,
  • un rehearsed,
  • spur moment,
  • off the top of ones head,
  • off the top one's head,
  • un practiced,
  • off the top of one head,
  • off top ones head,
  • off the top ones head,
  • off top of ones head,
  • off top one's head.
  •unstudied (adjective)
  • ex-temporary,
  • un-studied,
  • un studied,
  • ex temporary.

• a. & adv.

  •ad libitum (adjective, adverb)
  • spontaneously.
  •impromptu (adjective, adverb)
  • most improviso,
  • un scripted.

• adv.

  •ad libitum (adverb)
  • more spontaneously,
  • most spontaneously.

• n.

  •
  • arbitrary,
  • instinctive,
  • coincidental,
  • by accident,
  • accidental,
  • involuntary,
  • random.
  •extemporaneous (noun)
  • extempore,
  • extemporary,
  • unrehearsed,
  • offhanded,
  • unprepared.
  •spontaneous (noun)
  • ad-libbed,
  • without preparation.

• Other synonyms:

  •
  • snap.
  •ad-lib
  • ad lib.
  •extemporaneous
  • cuff.
  •informal
  • candid.
  •Other relevant words:
  • headlong,
  • momentary,
  • accident,
  • unguarded,
  • collar,
  • Unconcocted,
  • Undeliberated,
  • speck,
  • unconscious,
  • ready,
  • natural,
  • contingency,
  • Indeliberate,
  • vicar,
  • worker,
  • sudden,
  • soupcon,
  • unwritten,
  • proxy,
  • mite,
  • unready,
  • impetuous,
  • Unbegun,
  • summary,
  • haste,
  • Improvisate,
  • madcap,
  • reckless,
  • unpredictable,
  • touch,
  • procurator,
  • freewill,
  • precipitate,
  • devil-may-care,
  • unhatched,
  • emotional,
  • caught off balance,
  • Extemporized,
  • surprised,
  • jury-rigged,
  • Improvisatorial,
  • tripped up,
  • unorganized,
  • Unarranged,
  • instant,
  • unguided,
  • apprehension,
  • deputy,
  • taken aback,
  • wild,
  • foolhardy,
  • quick,
  • improvise,
  • Unmanufactured,
  • emergency,
  • brisk,
  • arrest,
  • stopgap,
  • unannounced,
  • voluntary,
  • temp,
  • pinch,
  • crisis,
  • unprimed,
  • unconsidered,
  • brief,
  • exigency,
  • taken by surprise,
  • caught short,
  • last-minute,
  • hint,
  • caught napping,
  • unpretentious,
  • unmade,
  • Extemporal.

Antonyms for Extemporaneous:

• adj.

  • improvised
    planned, deliberate, Rehearsed, premeditated, prepared.
  • Other antonyms:
    considered, premeditative, read, studied, written, elaborated, intended, intentional.