1. to feel resentment, disappointment, or anger about something; to harbor negative feelings about a past event or person
She is bitter about losing the promotion to her colleague.
Ela está amargada por ter perdido a promoção para sua colega.
2. to maintain a grudge or hold onto negative emotions about a situation
He has been bitter about the divorce for years.
Ele tem estado ressentido com o divórcio há anos.