Describes someone who is clever in a deceptive way.
El artero planificó su estrategia con astucia, esperando el momento perfecto para actuar sin ser descubierto.
The sly one planned his strategy cleverly, waiting for the perfect moment to act without being discovered.
El plan del artero para engañar a sus oponentes fue sorprendentemente ingenioso.
The cunning plan of the sly one to deceive his opponents was surprisingly clever.