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re‧spon‧si‧ble S2 W2

1 if someone is responsible for an accident, mistake, crime etc, it is their fault or they can be blamed
We are determined to bring the people responsible to justice.
guilty
[not before noun] responsible for
Police believe that the same man is responsible for three other murders in the area.
Police believe that the same man is responsible for three other murders in the area.
We are determined to bring the people responsible to justice.2 having a duty to be in charge of or to look after someone or something
in charge of
[not before noun] responsible for
Mills is responsible for a budget of over $5 million.
Mills is responsible for a budget of over $5 million.3 sensible and able to make good judgments, so that you can be trusted [≠ irresponsible; ↪ reliable]:
You can leave the children with Billy - he's very responsible.
sensible
You can leave the children with Billy - he's very responsible.4 if something is responsible for a change, problem, event etc, it causes it
cause
[not before noun] responsible for
The floods were responsible for over a hundred deaths.
The floods were responsible for over a hundred deaths.5 a job in which the ability to make good judgments and decisions is needed
responsible job/position
6 if you are responsible to someone, that person is in charge of your work and you must explain what you have done to them :
be responsible to somebody
GRAMMAR 
!! Responsible is always an adjective, never a noun. To be responsible for (doing) something can mean to have done something wrong • Who is responsible for this mess? It can also mean to have to do or take care of something • You're responsible for taking people's coats. • Our department is responsible for marketing.The person/company etc responsible is the person etc who has done something wrong • Police are determined to catch the man responsible (NOT the responsible). A responsible person, or someone who is responsible, is sensible • Children should be in the care of a responsible adult. • He's a very responsible young man.

!! Responsible is always an adjective, never a noun. To be responsible for (doing) something can mean to have done something wrong • Who is responsible for this mess? It can also mean to have to do or take care of something • You're responsible for taking people's coats. • Our department is responsible for marketing.The person/company etc responsible is the person etc who has done something wrong • Police are determined to catch the man responsible (NOT the responsible). A responsible person, or someone who is responsible, is sensible • Children should be in the care of a responsible adult. • He's a very responsible young man.
