careless, reckless
● Capricious
● Immature
● Thoughtless
● Immoral
● Carefree
● Devil-may-care
● Feckless
● Fickle
● Flighty
● Fly-by-night
● Giddy
● Harebrained
● Incautious
● Lax
● Loose
● Rash
● Scatterbrained
● Shiftless
● Unaccountable
● Undependable
● Unpredictable
● Unreliable
● Unstable
● Untrustworthy
● Wild
● Ill-considered
● No-account
● Unanswerable
● Responsible
● Liable
● Trustworthy
● Reliable
● Careful
● Accountable
● Uncareful