responsible · adjective /rɪˈspɑn.sə.bəl/Full view
Nouns: responsibility
Adjectives: responsible, irresponsible
Adverbs: responsibly, irresponsibly
be responsible for sb/sth/doing sth
B1 to be the person whose duty is to deal with someone or something
Dictionary examples:

I'm responsible for looking after the children during the lunch break.

Paul is directly responsible for the efficient running of the office.

Learner example:

My parent[s] went to Ireland for two weeks, and I was responsible for the house. (Preliminary English Test; B1; Spanish)

be responsible for sth/doing sth
B2 to be the person who caused something to happen, especially something bad
Dictionary example:

Who was responsible for the accident?

Learner example:

Sometimes walkers are also responsible for accidents, mainly when they are in a hurry. (First Certificate in English; B2; Portuguese)

responsible (GOOD JUDGMENT)
B2 showing good judgment and able to be trusted
Dictionary examples:

a hardworking and responsible employee

Let's stay calm and try to behave like responsible adults.

Many big companies are now becoming more responsible about the way they operate.

Learner example:

I know it is a great responsibility looking after them but I think I am reliable and responsible. (First Certificate in English; B2; Greek)

responsible (IMPORTANT)
B2 A responsible job is important because you have to make decisions that affect other people.
Dictionary example:

It's a very responsible job, being a teacher.

Learner example:

[The] people who I admire in today's world are journalists. In my opinion, they have a very responsible job. (First Certificate in English; B2; Polish)

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