1. A judgment or ruling that is not in one's favor; an adverse determination made by a court, authority, or decision-maker
The court issued an unfavorable decision against the defendant.
O tribunal proferiu uma decisão desfavorável contra o réu.
2. Any negative outcome or conclusion from a deliberative process
The company received an unfavorable decision from the regulatory board.
A empresa recebeu uma decisão desfavorável da junta reguladora.