1. An action, business transaction, or procedure of uncertain legality, ethics, or legitimacy
The company was involved in a dubious operation that raised red flags with authorities.
A empresa estava envolvida em uma operação duvidosa que levantou bandeiras vermelhas com as autoridades.
2. A transaction or activity with unclear or questionable motives and outcomes
The financial operação duvidosa was investigated by the fraud department.
A operação duvidosa financeira foi investigada pelo departamento de fraude.