This is the 7897th most frequent Portuguese word.
responsável
Responsible.
Here, "responsável" functions adjectivally to emphasize the quality of accountability or reliability in the subject of the sentence.
É importante ser responsável pelas suas ações.
It's important to be responsible for your actions.
Here, "responsável" is used as a noun to refer to someone in charge or accountable for an endeavor, giving them the role of the caretaker or manager.
Ela é a responsável pelo projeto.
She is the person responsible for the project.
In this sentence, "responsável" is used as an adjective to attribute accountability or blame to the noun it qualifies, providing a sense of obligation.