Definition for Extemporaneous:

• Of a prescription, devised for the occasion, and not according to a standing formula. Of a pharmaceutical preparation, one which must be prepared as required, owing to its tendency to deteriorate on standing, e. g., infusions. [ Lat.]

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.
  •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)
  • makeshift,
  • improvised,
  • ill-considered,
  • 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.

• 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)
  • informal,
  • ad-libbed,
  • on-the-spot,
  • without preparation,
  • ad hoc,
  • by ear,
  • on impulse.

• Other synonyms:

  •
  • snap.
  •ad-lib
  • ad lib.
  •extemporaneous
  • cuff.

Antonyms for Extemporaneous:

• adj.

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

Extemporaneous Sentence Examples:

• I endeavoured to display great coolness, and I do not think I failed very markedly as an extemporaneous orator.

• He saw, too, in a little while, that the nonsense of the lawyer had not even the solitary merit - if such it be - of being extemporaneous; and in the slow and monotonous delivery of a long string of stale truisms, not bearing any analogy to the case in hand, he perceived the dull elaborations of the closet.