Mourn·ful a. Full of sorrow; expressing, or intended to express, sorrow; mourning; grieving; sad; also, causing sorrow; saddening; grievous; as, a mournful person; mournful looks, tones, loss. -- Mourn*ful*ly, adv. -- Mourn*ful*ness, n.
Syn: -- Sorrowful; lugubrious; sad; doleful; heavy; afflictive; grievous; calamitous.
adv : in a mournful manner; "the young man stared into his glass