1. A topic or matter that relates to an individual's private life, feelings, or circumstances
I don't feel comfortable discussing that personal subject at work.
Não me sinto confortável discutindo esse assunto pessoal no trabalho.
2. In grammar, the pronoun or noun phrase that performs the action in a sentence
In the sentence 'I run,' the personal subject is 'I'.
Na frase 'Eu corro', o sujeito pessoal é 'eu'.