MOURNFUL 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.
NOCTURNAL a. 3 definitions
Of, pertaining to, done or occuring in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to Ant: diurnal. Dryden.