responsible
The word 'responsabile' in Italian is used in a similar way to the English word 'responsible'. It can refer to a person who is in charge of something or who is accountable for a task or situation. It can also be used as an adjective to describe someone who is reliable and trustworthy, or who takes their duties seriously.
I am responsible for the project
This statement is used when the person is leading a project and is the main one accountable for its success or failure
The person in charge of the office is Marco
This is used when indicating who is the primary individual that holds authority in an office; in this example, it is Marco
He is responsible for his behavior
This is used when indicating that a person is accountable for their own actions and the results of these actions