1. A plan, arrangement, or system that appears questionable, dubious, or potentially illegal or fraudulent
The police investigated the suspicious scheme involving fake documents.
A polícia investigou o esquema suspeito envolvendo documentos falsos.
2. An arrangement or setup that raises doubts about its legitimacy or honesty
That business deal looks like a suspicious scheme to me.
Esse negócio parece um esquema suspeito para mim.