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Synonyms
ad hoc, ad-lib, down and dirty, extemporaneous, extempore, impromptu, improvisational, improvised, off-the-cuff, offhand, offhanded, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unrehearsed, unstudied
Antonyms
considered, planned, premeditated, premeditative, prepared, rehearsed
1596, in the meaning defined above
More from Merriam-Webster on extemporary
Rhyming Dictionary: Words that rhyme with extemporary
Thesaurus: All synonyms and antonyms for extemporary
See Definitions and Examples
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