167 entries under adjective topic. ×

10
unstudied(free, casual, spontaneous, impromptu)
9
chance(careless, casual, random, haphazard)
9
spur-of-the-moment(noun, free, impulsive, spontaneous)
9
undesigned(planned, intention, unplanned, unintentional)
9
unmeditated(passionate, violent, impulse, abrupt)
8
ad lib(expression, idiom, free, casual)
8
off the cuff(expression, idiom, free, impromptu)
8
random(careless, chance, casual, haphazard)
8
unconscious(careless, natural, casual, thoughtless)
8
unwitting(ignorant, hidden, unconscious, oblivious)
7
haphazard(organization, plan, chance, casual)
7
improvised(free, casual, impulsive, impulse)
7
mechanical(rude, careless, natural, thoughtless)
7
reflex(natural, planned, ignorant, hidden)
7
uncalculated(ignorant, hidden, unconscious, unaware)
7
unconsidered(noun, passionate, violent, careless)
6
accustomed(natural, instinctive, automatic, involuntary)
6
congenital(natural, instinctive, automatic, involuntary)
6
fortuitous(chance, casual, intention, random)
6
habitual(natural, instinctive, unwilling, automatic)
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APASmart Define. (2015). unpremeditated thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unpremeditated/thesaurus/synonyms
ChicagoSmart Define. 2015. "unpremeditated thesaurus" https://smartdefine.org/unpremeditated/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, unpremeditated thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unpremeditated/thesaurus/synonyms>.
MLASmart Define. "unpremeditated thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/unpremeditated/thesaurus/synonyms>