Longman Dictionary of Contemporary English - responsible

~ adj 1 »GUILTY« if someone is responsible for an accident, mistake, crime etc, it is their fault or they can be blamed + for  (The police arrested those responsible for the burglaries. | When he loses his temper, he isn't responsible for his actions. | If any of the children got hurt, I should feel responsible.) hold sb responsible (for) (=blame someone for something)  (I shall hold you personally responsible for anything that goes wrong.) 2 »IN CHARGE OF« having a duty to be in charge of or to look after someone or something + for  (Each commissioner is responsible for a department. | They're not my children, but I still feel responsible for them.) 3 responsible job/position/post a job in which the ability to make good judgments and decisions is needed 4 »SENSIBLE« sensible and able to make good judgments so that you can be trusted  (You can leave the children with Stuart - he's very responsible.)  (- opposite irresponsible) 5 be responsible to if you are responsible to someone, that person is in charge of your work and you must explain your actions to them  (In the US, cabinet members are directly responsible to the president.) 6 »CAUSE« if something is responsible for a change, problem, event etc, it causes it + for  (Social changes are responsible for many of our modern problems.)