| off the cuff(expression, adjective, idiom, free, unrehearsed) |
| quick(noun, adjective) |
| rash(noun, adjective, impulsive, unthinking) |
| undevised(adjective, planned, unintentional, accidental, inadvertent) |
| unmeant(adjective, planned, unknowing, unaware, unintentional) |
| unrehearsed(adjective, free, informal, casual, unqualified) |
| unthinking(adjective, impulsive, rash, unknowing, unaware) |
| ad-lib(adjective, free, simple, fake, informal) |
| aleatory(adjective, planned, accidental, unintended) |
| coincidental(adjective, chance, unintentional, accidental, unintended) |
| ignorant(adjective, impulsive, unknowing, unaware, unsuspecting) |
| makeshift(adjective, free, informal, casual, impulsive) |
| out of the blue(expression, adjective, idiom, adverb, unprepared) |
| rambling |
| serendipitous(adjective, chance, lucky, accidental, unpremeditated) |
| spot(adjective, chance, casual, irregular, planned) |
| unanticipated(adjective, adverb) |
| unconsidered(noun, adjective, chance, casual, irregular) |
| uncontrived(adjective, simple, natural, casual, impulsive) |
| unknowing(adjective, unaware, unintentional, unsuspecting) |