1. To officially state or announce that someone or something is not suitable, capable, or qualified for a particular purpose or role
The doctor declared him unfit for duty due to his medical condition.
O médico o declarou inapto para o serviço devido à sua condição médica.
2. To judge or pronounce legally or officially that something does not meet required standards
The inspector declared the building unfit for habitation.
O inspetor declarou o edifício impróprio para habitação.