extemporaneous

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UK:^*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪkˌstɛmpəˈreɪnɪəs/

US:USA pronunciation: IPAUSA pronunciation: IPA/ɪkˌstɛmpəˈreɪniəs/

US:USA pronunciation: respellingUSA pronunciation: respelling(ik stem′pə rā′nē əs)

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extemporaneous
WordReference English Thesaurus © 2025

Synonyms:

spontaneous, unpremeditated, improvised, extempore, extemporary, impromptu, unprepared, ad-lib, ad-libbed, offhand, unstudied, informal , unrehearsed, ad hoc, by ear, on impulse, on the spot, without preparation, off the cuff, spur-of-the-moment, unplanned, snap (slang), off the top of one's head (slang), uncontrived

Antonyms:

considered , planned, prepared , premeditated, studied, rehearsed

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