Entry Word: extemporaneous

Function: adjective

Meaning: made or done without previous thought or preparation <caught by surprise, I had to make an extemporaneous speech at the awards banquet>

Synonyms ad-lib, extempore, impromptu, improvised, offhand, offhanded, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unrehearsed

Related Words automatic, impulsive, instinctive, involuntary, spontaneous; casual, informal, unauthorized

Near Antonyms deliberate, intended, intentional

Antonyms considered, planned, premeditated, prepared, rehearsed