Synonyms of unmeditated

1 Syllable
swift, mad, quick, rash
2 Syllables
headlong, will-less, abrupt, re-flex, violent, flaky, hasty, sudden, offhand, ad-lib
3 Syllables
spontaneous, instinctual, impetuous, unwilled, careless, hot-and-cold, unprompted, up-and-down
4 Syllables
intuitional, impulsive, emotional, passionate, automatic, instinctive, reflexive, devil-may-care, intuitive, unexpected
5 Syllables
second-nature, extemporaneous, unpredictable, uncalculated, involuntary, precipitate, unconsidered, autogenetic
6 Syllables
unpremeditated