1. An explanation that lacks clarity, credibility, or convincing evidence; a statement intended to clarify something that raises questions or skepticism about its validity
His doubtful explanation for missing the meeting did not satisfy the manager.
Sua explicação duvidosa pela ausência à reunião não satisfez o gerente.
2. A justification or account of events that is open to question or disbelief
The witness gave a doubtful explanation of what happened at the scene.
A testemunha deu uma explicação duvidosa do que aconteceu no local.