| native(adjective, natural, instinctive, automatic, involuntary) |
| normal(adjective, natural, instinctive, automatic, involuntary) |
| regular(adjective, natural, instinctive, automatic, involuntary) |
| rooted(adjective, natural, instinctive, automatic, involuntary) |
| second-nature(adjective, instinctive, automatic, involuntary, reflex) |
| swift(adjective, quick, thoughtless, unthinking, abrupt) |
| typical(adjective, natural, instinctive, automatic, involuntary) |
| undependable(adjective, unstable, irregular, unsettled, unpredictable) |
| unplanned(noun, adjective, simple, violent, natural) |
| unwitting(adjective, necessity, unwilling, obligatory, compulsory) |
| vacillating(adjective, unstable, irregular, unsettled, unpredictable) |
| variable(adjective, careless, lively, active, unstable) |
| wayward(adjective, unusual, careless, unstable, unreasonable) |
| congenital(adjective, natural, instinctive, automatic, involuntary) |
| inborn(adjective, natural, instinctive, automatic, involuntary) |
| arbitrary(adjective, unusual, careless, unstable, unreasonable) |
| ardent(adjective, strong, moving, difficult, intense) |
| audacious(adjective, smart, rude, careless, bold) |
| casual(adjective, smooth, simple, easy, careless) |
| flitting(adjective, capricious, irresolute, motiveless) |