responsible

The individual who bears the responsibility for something.

An actor taking on the lesser roles in repertory theatre.

(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.

“Parents are responsible for their child's behaviour.”

(followed by "for") 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?”

(followed by "to") Answerable to (a superior).

(of a job or position) Involving important duties; involving a degree of personal accountability on the part of the person concerned.

“She has a responsible position in the firm.”

Having good judgment in decision-making.

Able to be trusted; reliable; trustworthy.

“He looks like a responsible guy.”

Capable of rational conduct and thus morally accountable for one's behavior.