Same as subtile, 1.Same as subtile, 2.Sly; insinuating; artful; cunning; crafty; deceitful; treacherous: as, a subtle adversary; a subtle scheme. Also subtile.Cunningly devised; artfully contrived or handled; ingenious; clever: as, a subtle stratagem. Also subtile.Characterized by acuteness and penetration of mind; sagacious; discerning; discriminating; shrewd; quick-witted: as, a subtle understanding; subtle penetration or insight. Also subtile.Made carefully level; smooth; even.Ingenious; skilful; clever; handy: as, a subtle operator. Also subtile.