ad-lib
     adj 1: said or done without having been planned or written in
            advance; "he made a few ad-lib remarks" [syn: {spontaneous},
             {unwritten}]
     2: 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: {extemporaneous}, {extemporary},
         {extempore}, {impromptu}, {offhand}, {offhanded}, {off-the-cuff},
         {unrehearsed}]
     n : remark made spontaneously without prior preparation; "his
         ad-libs got him in trouble with the politicians"
     v : perform without preparation; "he extemporized a speech at
         the wedding" [syn: {improvise}, {improvize}, {extemporize},
          {extemporise}]
     [also: {ad-libbing}, {ad-libbed}]
Source: WordNet® 2.0