Webster's Revised Unabridged Dictionary · 1913

Wily

Wily , adjective

[From Wile.]

Full of wiles, tricks, or stratagems; using craft or stratagem to accomplish a purpose; mischievously artful; subtle.
Wily and wise. — Chaucer
The wily snake. — Milton
This false, wily, doubling disposition of mind. — South