Entry 1 sense Webster, 1913 Archly /ärch′-lē/ · Arch·ly · IPA /ˈɑɹt͡ʃ.li/ 01 adv. In an arch manner; with attractive slyness or roguishness; slyly; waggishly. 1. In an arch manner; with attractive slyness or roguishness; slyly; waggishly. “Archly the maiden smiled.” — Longfellow.