1. the quality or state of not being reliable, honest, or worthy of trust
His untrustworthiness made it difficult for colleagues to work with him.
A falta de confiabilidade dele dificultava o trabalho com colegas.
2. the characteristic of being deceptive or unreliable in one's actions or words
The untrustworthiness of the source cast doubt on the report's accuracy.
A falta de confiabilidade da fonte levantou dúvidas sobre a precisão do relatório.