| incidental(adjective, careless, casual, arbitrary, serendipitous) |
| inconsiderate(adjective, careless, bold, thoughtless, impulsive) |
| inconsiderately |
| indiscreet(adjective, careless, bold, thoughtless, impulsive) |
| injudicious(adjective, careless, bold, thoughtless, impulsive) |
| loose(adjective, careless, casual, arbitrary) |
| madcap(adjective, careless, bold, thoughtless, wary) |
| messily |
| neglectful(adjective, careless, bold, thoughtless, impulsive) |
| negligent(adjective, slow, careless, bold, thoughtless) |
| not careful(expression, adjective, careless, bold, thoughtless) |
| off guard(expression, adjective, careless, bold, thoughtless) |
| offhandedly |
| once over lightly(expression, idiom) |
| pay no mind(expression, idiom, careless, bold, thoughtless) |
| perfunctorily |
| playing with fire(expression, idiom, careless, bold, thoughtless) |
| precipitate(adjective, careless, bold, thoughtless, wary) |
| promiscuously |
| purposeless(adjective, careless, casual, arbitrary) |