1. to behave or conduct oneself in a manner that is not just, equitable, or impartial
The referee was accused of acting unfairly by giving more fouls to one team.
O árbitro foi acusado de agir injustamente ao dar mais faltas para um time.
2. to treat someone or something with prejudice or bias
Management acted unfairly by denying promotions without considering all candidates equally.
A gerência agiu injustamente ao negar promoções sem considerar todos os candidatos igualmente.