Synonyms|312Antonyms|17|Broader|5Narrower|0Related|26

59 entries under impromptu topic. ×

1
made-up(adjective, free, informal, casual, impulsive)
1
off the hip(expression, idiom, offhand, extemporaneous)
1
off top of head(expression, adjective, idiom, adverb, simple)
1
on-the-spot(free, fake, casual, impulsive, spontaneous)
1
spur of the moment(expression, idiom, free, casual, offhand)
1
unartful(adjective, simple, natural, casual, impulsive)
1
unavoidable(adjective, simple, natural, casual, impulsive)
1
unbidden(adjective, simple, natural, casual, impulsive)
1
uncompelled(adjective, simple, natural, casual, impulsive)
1
unconscious(adjective, simple, natural, casual, impulsive)
1
unconstrained(adjective, simple, natural, casual, impulsive)
1
uncontrolled(adjective, simple, natural, casual, impulsive)
1
unintentional(adjective, simple, natural, casual, impulsive)
1
unpremediated(adjective, simple, natural, casual, impulsive)
1
unprompted(adjective, adverb, simple, violent, natural)
1
voluntary(adjective, simple, natural, casual, impulsive)
1
willing(adjective, simple, natural, casual, impulsive)
0
off the top of head(expression, idiom, offhand, extemporaneous)
0
throwaway
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ChicagoSmart Define. 2015. "ad-lib thesaurus" https://smartdefine.org/ad-lib/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, ad-lib thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/ad-lib/thesaurus/synonyms>.
MLASmart Define. "ad-lib thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/ad-lib/thesaurus/synonyms>