| unconscious(adjective, simple, natural, casual, impulsive) |
| unconsidered(noun, thoughtless, impetuous, unwary) |
| undesigned(adjective, unplanned, unintentional, accidental, inadvertent) |
| unintended(adjective, chance, unplanned, unintentional, accidental) |
| unpredictable(noun, thoughtless, impetuous, unwary) |
| voluntary(adjective, simple, natural, casual, impulsive) |
| accidental(chance, unplanned, unpremeditated, inadvertent) |
| according to pleasure(expression, idiom, adverb, impulsive, extemporize) |
| aimless(unplanned, accidental, inadvertent) |
| as one thinks best(expression, idiom, adverb, impulsive, extemporize) |
| as one wishes(expression, idiom, adverb, impulsive, extemporize) |
| at will(expression, adverb, informal, impulsive, extemporize) |
| autoschediastic(adjective, free, casual, impulsive, spontaneous) |
| break loose(expression, adjective, simple, natural, casual) |
| caught napping |
| caught off balance(expression, idiom) |
| caught short |
| chance(unplanned, accidental, unpremeditated, inadvertent) |
| dashed off(expression, fake, unprepared, unplanned, unrehearsed) |
| devil-may-care(noun, thoughtless, impetuous, unwary) |