<p><strong>Adjective</strong></p><ul><li>Comparative: slyer or slier</li><li>Superlative: slyest or sliest</li><li>Cunning or wily: sly as a fox.</li><li>Synonyms: astute, shrewd, crafty, foxy, subtle, artful</li><li>Antonyms: obvious, direct</li><li>Stealthy, insidious, or secret.</li><li>Synonyms: clandestine, underhand, furtive, surreptitious</li><li>Playfully artful, mischievous, or roguish: sly humor.</li></ul><p><strong>Noun</strong></p><ul><li>A clever trick or stratagem; a cunning, crafty device or expedient; wile.</li><li>Synonyms: subterfuge</li><li>Trickery; guile; craftiness.</li><li>Synonyms: duplicity, art, deceit, deception</li><li>Cunning; ingenuity; inventiveness: a drawing-room comedy crafted with artifice and elegance.</li><li>A skillful or artful contrivance or expedient.</li></ul>