| unprompted(adjective, simple, natural, casual, impulsive) |
| extemporary(adjective, free, casual, impulsive, spontaneous) |
| extemporized(adjective, informal, spontaneous, unprepared, unrehearsed) |
| fluky(adjective, chance, casual, random, haphazard) |
| hurried(adjective, impulsive, rash, unthinking) |
| instinctive(noun, adjective, simple, natural, casual) |
| natural(adjective, simple, casual, impulsive, willing) |
| reckless(noun, adjective, impulsive, rash, unthinking) |
| unannounced |
| unarranged(adjective, spontaneous, unprepared, unrehearsed, unpremeditated) |
| unaware(adjective, unqualified, unknowing, unsuspecting, unready) |
| uncalculated(adjective, chance, unintentional, accidental, unintended) |
| arbitrary |
| automatic(adjective, free, simple, fake, natural) |
| designless(adjective, insignificant, casual, irregular, senseless) |
| free(adjective, simple, fake, natural, casual) |
| headlong(noun, adjective, impulsive, rash, unthinking) |
| incognizant(unknowing, unaware, unsuspecting) |
| informal(adjective, free, casual, impulsive, unprepared) |
| naturally |