1. Involving or characterized by betrayal of trust, loyalty, or allegiance toward a person, group, or cause
His actions were traitorous to his country and his fellow soldiers.
Suas ações foram traiçoeiras para com seu país e seus camaradas.
2. Disloyal or faithless in relation to someone or something one should support
The general's decision to surrender was seen as traitorous to the king.
A decisão do general de se render foi vista como desleal para com o rei.