| unguarded(adjective, careless, casual, thoughtless, heedless) |
| inadvertent(casual, happy-go-lucky, slapdash) |
| lax(casual, happy-go-lucky, slapdash) |
| loose(casual, happy-go-lucky, slapdash) |
| negligent(careless, casual, thoughtless, heedless, happy-go-lucky) |
| remiss(casual, happy-go-lucky, slapdash) |
| unwary(adjective, thoughtless, heedless) |
| careless(adjective, casual, thoughtless, heedless, happy-go-lucky) |
| casual(candid, spontaneous, happy-go-lucky, offhand, slapdash) |
| derelict |
| hasty(careless, casual, thoughtless, heedless, happy-go-lucky) |
| heedless(careless, casual, thoughtless, happy-go-lucky, slapdash) |
| imprudent(careless, casual, thoughtless, heedless, happy-go-lucky) |
| inattentive |
| incautious(careless, casual, thoughtless, heedless, candid) |
| inconsiderate(careless, casual, thoughtless, heedless, happy-go-lucky) |
| indiscreet(careless, casual, thoughtless, heedless, happy-go-lucky) |
| laissez-faire |
| napping(casual, happy-go-lucky, slapdash) |
| neglectful |