extemporaneous

from WordNet (r) 3.0 (2006)

extemporaneous
    adj 1: with little or no preparation or forethought; "his ad-lib
           comments showed poor judgment"; "an extemporaneous piano
           recital"; "an extemporary lecture"; "an extempore skit";
           "an impromptu speech"; "offhand excuses"; "trying to
           sound offhanded and reassuring"; "an off-the-cuff toast";
           "a few unrehearsed comments" [syn: {ad-lib},
           {extemporaneous}, {extemporary}, {extempore},
           {impromptu}, {offhand}, {offhanded}, {off-the-cuff},
           {unrehearsed}]

from The Collaborative International Dictionary of English v.0.48

Extemporaneous \Ex*tem`po*ra"ne*ous\, a. [See {Extempore}.]
   Composed, performed, or uttered on the spur of the moment, or
   without previous study; unpremeditated; off-hand; ad-lib;
   extempore; extemporary; as, an extemporaneous address or
   production. -- {Ex*tem`po*ra"ne*ous*ly}, adv. --
   {Ex*tem`po*ra"ne*ous*ness},n.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

52 Moby Thesaurus words for "extemporaneous":
      ad lib, ad libitum, ad-lib, casual, caught napping,
      caught off balance, caught short, extemporary, extempore,
      extemporized, haphazard, hasty, impromptu, improvisatorial,
      improvise, improvised, improviso, impulsive, informal, jury-rigged,
      makeshift, off the cuff, off-the-cuff, offhand, precipitate,
      rough-and-ready, snap, spontaneous, spur-of-the-moment, stopgap,
      surprised, taken aback, taken by surprise, taken unawares,
      tripped up, unarranged, unbegun, unconcocted, uncontrived,
      undeliberated, undevised, unhatched, unmade, unmanufactured,
      unorganized, unplanned, unpremeditated, unprepared, unprimed,
      unready, unrehearsed, unstudied

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