20 entries under informal topic. ×

10
spontaneous(noun, adjective, free, fake)
5
snap(noun, adjective, free, fake)
4
off-the-cuff(adjective, impulsive, prepared, spontaneous)
3
automatic(adjective, free, casual, impulsive)
3
casual(adjective, free, impulsive, unprepared)
3
immediate(noun, adjective, free, casual)
2
expedient(adjective, free, casual, snap)
2
fake(adjective, free, casual, spontaneous)
2
free(adjective, casual, impulsive, unprepared)
2
tossed off(expression, free, casual, unrehearsed)
1
at first glance(expression, free, casual, snap)
1
improvisatory(adjective, free, casual, snap)
1
jamming(adjective, free, casual, snap)
1
made-up(adjective, free, casual, spontaneous)
1
makeshift(adjective, free, casual, spontaneous)
1
on-the-spot(adjective, free, casual, snap)
1
taking for ride(expression, free, casual, snap)
1
thought out loud(expression, free, casual, snap)
1
tossed out(expression, free, casual, snap)
0
off top of head(expression, idiom, impulsive, snap)
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APASmart Define. (2015). spur-of-the-moment thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/spur-of-the-moment/thesaurus/synonyms
ChicagoSmart Define. 2015. "spur-of-the-moment thesaurus" https://smartdefine.org/spur-of-the-moment/thesaurus/synonyms (accessed October 2, 2026).
HarvardSmart Define 2015, spur-of-the-moment thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/spur-of-the-moment/thesaurus/synonyms>.
MLASmart Define. "spur-of-the-moment thesaurus" 13 April 2015. Web. 2 October 2026. <https://smartdefine.org/spur-of-the-moment/thesaurus/synonyms>