| unexpected(adjective, chance, unplanned, unintentional, accidental) |
| unforeseen(adjective, chance, intention, unplanned, unintentional) |
| extemporaneous(adjective, chance, unplanned, unintentional, accidental) |
| haphazard(adjective, unknowing, unaware, unplanned, unintentional) |
| reflex(ignorant, hidden, unconscious, unaware, oblivious) |
| reflexive(forced, unwilling, obligatory, compulsory) |
| uncaused |
| unstudied |
| adventitious(adjective, chance, unplanned, unintentional, accidental) |
| careless(adjective, thoughtless, inconsiderate) |
| erratic(adjective, chance, unplanned, unintentional, accidental) |
| forced(unwilling, obligatory, compulsory) |
| gut(ignorant, hidden, unconscious, unaware, oblivious) |
| heedless(adjective, careless, thoughtless, inconsiderate) |
| impulsive(adjective, rude, careless, chance, thoughtless) |
| inattentive(adjective, ignorant, hidden, unconscious, unaware) |
| incidental(adjective, chance, unplanned, unintentional, unpremeditated) |
| instinctive(adjective, rude, careless, thoughtless, unwise) |
| purposeless(adjective, unplanned, unintentional, accidental, inadvertent) |
| snap |