SLY

adjective (slier or ~er; sliest or ~est) see: slay Date: 13th century 1. chiefly dialect wise in practical affairs, displaying cleverness ; ingenious , 2. clever in concealing one's aims or ends ; furtive , lacking in straightforwardness and candor ; dissembling , lightly mischievous ; roguish , ~ly also slily adverb ~ness noun Synonyms: see: ~