responsible

noun1 of 2

having the duty of dealing with something; being the cause or creator of something; behaving in a mature and reasonable manner

• “It's important to be responsible and turn off the lights.”Tatoeba
• “I am the one who is responsible for the accident.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

adjective2 of 2

(followed by "for") Having the duty of taking care of something; answerable for an act performed or for its consequences; accountable; amenable, especially legally or politically.