Synonyms|145Antonyms|12|Broader|0Narrower|0Related|19
3
improvised(adjective, free, prepared, spontaneous, unprepared)
3
involuntary(noun, adjective, impulsive, unprompted)
3
rash(noun, adjective, impulsive, unthinking)
2
ad hoc(expression, adjective, free, casual, unrehearsed)
2
ad lib(expression, adjective, free, casual, unrehearsed)
2
expedient(adjective, free, informal, casual, snap)
2
fake(adjective, free, informal, casual, spontaneous)
2
free(adjective, informal, casual, impulsive, unprepared)
2
headlong(noun, adjective, quick, impulsive, rash)
2
improv(adjective, free, casual, spontaneous, unprepared)
2
improviso(adjective, free, spontaneous, unprepared, unplanned)
2
informal(adjective, free, spontaneous, impromptu, unrehearsed)
2
instinctive(noun, impulsive, unprompted)
2
precipitate(noun, adjective, quick, impulsive, rash)
2
quick(noun, adjective, swift, sudden, rushed)
2
reckless(noun, adjective, impulsive, rash, unthinking)
2
tossed off(expression, free, informal, casual, unrehearsed)
1
abrupt(adjective, quick, impulsive, rash, unthinking)
1
at first glance(expression, free, informal, casual, snap)
1
autoschediastic(adjective, free, casual, impulsive, spontaneous)
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ChicagoSmart Define. 2015. "spur-of-the-moment thesaurus" https://smartdefine.org/spur-of-the-moment/thesaurus/synonyms (accessed October 2, 2026).
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MLASmart Define. "spur-of-the-moment thesaurus" 13 April 2015. Web. 2 October 2026. <https://smartdefine.org/spur-of-the-moment/thesaurus/synonyms>