\Sad"ly\, adv. 1. Wearily; heavily; firmly. [Obs.] In go the spears full sadly in arest. --Chaucer. 2. Seriously; soberly; gravely. [Obs.] To tell thee sadly, shepherd, without blame Or our neglect, we lost her as we came. --Milton. 3. Grievously; deeply; sorrowfully; miserably. ``He sadly suffers in their grief.'' --Dryden.