extemporaneous
1. [ adjective ] with little or no preparation or forethought
Synonyms: impromptu extemporary unrehearsed off-the-cuff offhand offhanded extempore ad-lib
Examples:

"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 reassurin

Related terms: unprepared
2. [ adjective ] with little or no preparation or forethought
Synonyms: extemporary extempore offhand offhanded off-the-cuff unrehearsed ad-lib
Examples:

"ad-lib commentst" "an extemporaneous piano recital" "an extemporary lecture" "an extempore skit" "offhand excuses" "trying to sound offhanded" "an off-the-cuff toast" "a few unrehearsed comments"

Related terms: unprepared
Similar spelling:   extemporaneously
  extemporize
  extemporise
  extemporary
  extemporarily
  extemporization
  extemporisation