| inadvertent(adjective, careless, indifferent, casual, unconcerned) |
| informally |
| involuntary(noun, adjective, simple, violent, natural) |
| laid-back(adjective, calm, cool, mild, careless) |
| light-hearted |
| loose(adjective, calm, cool, careless, relaxed) |
| off the hip(expression, adjective, idiom, adverb, impromptu) |
| out of hand(expression, idiom, earliness) |
| rude(adjective, rough, careless, fresh, crude) |
| slipshod(adjective, careless, indifferent, casual, sloppy) |
| unconstrained(adjective, simple, natural, cheerful, casual) |
| ungracious(adjective, rude, fresh, crude, angry) |
| unheeding(casual, inattention, happy-go-lucky, slapdash) |
| accidental(adjective, careless, chance, casual, arbitrary) |
| airy(adjective, calm, cool, relaxed, detached) |
| any old way(expression, idiom, careless, casual, arbitrary) |
| any which way(expression, idiom, careless, casual, arbitrary) |
| at short notice(expression, idiom, earliness) |
| at sight(expression, idiom, earliness) |
| blase(calm, cool, relaxed, detached, casual) |