Entry 1 sense Webster, 1913 Throughly · Through·ly · IPA /ˈθɹuːli/ 01 adv. Thoroughly. 1. Thoroughly.[Obs.] “Wash me throughly from mine iniquity.” — Ps. li. 2. “To dare in fields is valor; but how few Dare to be throughly valiant to be true?” — Dryden.