Superlatively sneaky

Usage examples of slyest.

Alain had seen enough conspiracy at court to know even the slyest of schemers gave away their intentions in their demeanor, if watched long enough.

Also, there is—I confess—a certain joy in tricking the slyest trickster of our time.

In fact,’ Hamian said, his smile a fair match for Toric’s at his slyest, ‘I’ll take anything that can breathe and walk to get those mines started.

Hamian said, his smile a fair match for Toric's at his slyest, "I'll take anything that can breathe and walk to get those mines started.

In fact,” Hamian said, his smile a fair match for Toric’s at his slyest, “I’ll take anything that can breathe and walk to get those mines started.