Adjective responsible has 3 senses
  1. responsible - worthy of or requiring responsibility or trust; or held accountable; "a responsible adult"; "responsible journalism"; "a responsible position"; "the captain is responsible for the ship's safety"; "the cabinet is responsible to the parliament"
    irresponsible, carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum, slaphappy, do-nothing, feckless, flighty, head-in-the-clouds, scatterbrained, idle, loose, trigger-happy, unaccountable, unreliable
  2. responsible, responsible for - being the agent or cause; "determined who was the responsible party"; "termites were responsible for the damage"
    Antonyms: noncausative, noncausal (indirect, via causative)
  3. creditworthy, responsible - having an acceptable credit rating; "a responsible borrower"
    Antonyms: untrustworthy, untrusty (indirect, via trustworthy)