Synonyms|241Antonyms|112|Broader|3Narrower|0Related|712
1
jury-rigged
1
mad(thoughtless, impetuous, unwary)
1
madcap(noun, thoughtless, impetuous, unwary)
1
made-up(adjective, free, impulsive, spontaneous, impromptu)
1
off-hand
1
off top of head(expression, adjective, idiom, simple, natural)
1
on-the-spot(adjective, free, casual, impulsive, spontaneous)
1
on impulse(expression, adjective, free, casual, impulsive)
1
played by ear(expression, idiom, fake, unprepared, unplanned)
1
purposeless(unplanned, accidental, inadvertent)
1
random(chance, unplanned, accidental, unpremeditated, inadvertent)
1
reckless(noun, thoughtless, impetuous, unwary)
1
shot from the hip(expression, idiom, fake, unprepared, unplanned)
1
simple(adjective, natural, casual, crude, impulsive)
1
stopgap
1
surprised
1
swift(thoughtless, impetuous, unwary)
1
taken aback
1
taken by surprise(expression, idiom)
1
taken unawares
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HarvardSmart Define 2015, extemporaneous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/extemporaneous/thesaurus/synonyms>.
MLASmart Define. "extemporaneous thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/extemporaneous/thesaurus/synonyms>