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Adjective: irresponsible  ,i-ri'spón-su-bul
  1. Showing lack of care for consequences
    "behaved like an irresponsible idiot"; "hasty and irresponsible action"

See also: carefree, devil-may-care, do-nothing [informal], feckless, freewheeling, happy-go-lucky, harum-scarum, idle, loose, responsibility, responsibleness, slaphappy [informal], trigger-happy, unaccountable, unreliable

Antonym: responsible

Encyclopedia: Irresponsible