1. A method, procedure, or skill that raises doubts about its legitimacy, safety, or ethical nature
The coach was accused of using suspicious techniques to enhance athlete performance.
O treinador foi acusado de usar técnicas suspeitas para aprimorar o desempenho do atleta.
2. An approach or method that appears questionable or potentially deceptive
The company's marketing employed suspicious techniques to mislead consumers.
O marketing da empresa empregava técnicas suspeitas para enganar consumidores.