ad-lib

Noun
  1. Remark made spontaneously without prior preparation (synset 106727636)
    "his ad-libs got him in trouble with the politicians"
Adjective
  1. With little or no preparation or forethought (synset 301851375)
    "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"
  2. Said or done without having been planned or written in advance (synset 302221226)
    "he made a few ad-lib remarks"
Verb
  1. Perform without preparation (synset 201732719)
    "he extemporized a speech at the wedding"

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