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ex·tem·po·ra·ne·ous

extemporaneous

pronunciation:
ihk stem p reI ni s
part of speech: adjective
definition 1: not planned or prepared; impromptu.
It was hard to believe that this hilarious and heartwarming toast was in fact extemporaneous.
synonyms:
extempore, impromptu, improvised, unrehearsed
similar words:
ad-lib, impulsive, makeshift, off the cuff, offhand, spontaneous, unplanned
definition 2: of a speech, delivered with little or no reference to notes or prepared text.
Her lectures, although extemporaneous, always cover the points she wants to get across.
synonyms:
extempore, off the cuff, spontaneous, unrehearsed
similar words:
impromptu, improvised, informal, offhand
definition 3: capable of or accustomed to performing with little or no preparation or rehearsal.
synonyms:
improvisational
similar words:
impulsive, spontaneous
definition 4: provided or made with anything available; makeshift.
synonyms:
improvised, makeshift, stopgap
similar words:
ersatz, haphazard, provisional, slapdash, temporary
derivations: extemporaneously (adv.), extemporaneity (n.), extemporaneousness (n.)