This is the 11859th most frequent Portuguese word.
proibido
"Proibido" means "forbidden" or "prohibited" in English.
In this case, 'proibidas' is used adjectivally to describe activities that are not allowed.
Não é permitido realizar atividades proibidas.
Activities that are forbidden cannot be performed.
Here, 'proibido' is used as an adjective describing the state of parking being forbidden.
É proibido estacionar aqui.
It is forbidden to park here.
In this sentence, 'proibido' works as a past participle, indicating that access has been restricted.