WILY Meaning of WILY in English a. Insidious, artful, cunning, sly, crafty, subtle, arch, designing, deceitful, treacherous, trickish, tricky, intriguing, politic, foxy, snaky, crooked, diplomatic, Machiavelian. Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012