| spontaneous(noun, adjective, free, impulsive, planned) |
| impulsive(noun, adjective, rude, careless, natural) |
| unplanned(noun, adjective, free, chance, casual) |
| extemporaneous(noun, adjective, impulsive, planned, impulse) |
| involuntary(noun, adjective, natural, planned, ignorant) |
| impromptu(adjective, adverb, free, impulsive, planned) |
| unintentional(adjective, chance, planned, ignorant, hidden) |
| unthinking(adjective, careless, casual, impulsive, instinctive) |
| accidental(adjective, careless, chance, casual, planned) |
| casual(adjective, free, careless, chance, random) |
| offhand(noun, adjective, free, careless, casual) |
| natural(adjective, impulse, instinctive, automatic, involuntary) |
| extempore(adjective, free, planned, spontaneous, impromptu) |
| hasty(adjective, passionate, violent, thoughtless, impulsive) |
| instinctive(noun, adjective, rude, passionate, violent) |
| automatic(adjective, free, casual, planned, spontaneous) |
| inadvertent(adjective, careless, casual, thoughtless, unwise) |
| unintended(adjective, rude, careless, chance, casual) |
| unprepared(adjective, free, spontaneous, impromptu, unplanned) |
| unprompted(adjective, passionate, violent, impulse, abrupt) |