responsible UK /ɹɪˈspɒn.sə.bəl/US /ɹɪˈspɑn.sə.bəl/adjective 7noun 2forms 3 adjective7 •[after a noun] having the duty to take care of someone or something, and to accept the blame for problemsParents are responsible for their child's behaviour. •Answerable to (a superior). •[after a noun] Being a primary cause of a situation or action and thus able to be blamed or credited for it.Who is responsible for this mess? •Having good judgment in decision-making. •Able to be trusted; reliable; trustworthy.He looks like a responsible guy. •Involving important duties; involving a degree of personal accountability on the part of the person concerned.She has a responsible position in the firm. •Capable of rational conduct and thus morally accountable for one's behavior. noun2 •An actor taking on the lesser roles in repertory theatre.[…] first appeared on August Bank Holiday, 1901, at Grand Theatre, Llandudno, playing "responsibles" with Edward Compton; […] — 1907 •(no longer used) The person who bears the responsibility for something. formsresponsibles · more responsible · most responsible