Synonyms|363Antonyms|90|Broader|9Narrower|7Related|1k
1
off-hand
1
off the top of head(expression, idiom, adverb, free, unrehearsed)
1
off the top of one's head
1
off top of head(expression, adjective, idiom, adverb, simple)
1
offhandedly
1
on-the-spot(free, casual, impulsive, spontaneous, unprepared)
1
on impulse(expression, free, casual, impulsive, unrehearsed)
1
on sight
1
out of hand(expression, idiom)
1
pickup(noun, boost, extemporization)
1
played by ear(expression, adjective, idiom, adverb, unqualified)
1
playing by ear(expression, idiom)
1
pro tempore
1
riff
1
shot from the hip(expression, adjective, idiom, adverb, mock)
1
simple(adjective, natural, casual, impulsive, willing)
1
spur of the moment(expression, idiom, adverb, free, casual)
1
taken aback
1
taken by surprise(expression, idiom)
1
taken off guard(expression, idiom, unqualified, unsuspecting, unready)
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HarvardSmart Define 2016, impromptu thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impromptu/thesaurus/synonyms>.
MLASmart Define. "impromptu thesaurus" 28 January 2016. Web. 21 September 2026. <https://smartdefine.org/impromptu/thesaurus/synonyms>