Gloomy; dreary; cheerless; melancholy; doleful; dolorous: originally, as an adjective, in the phrase dismal day or dismal days (see etymology), whence it was extended to any visible physical surroundings, or anything perceived or apprehended, tending to depress or chill the spirits.n. See extract and etymology.n. Gloom; melancholy; dumps: usually in the plural, in the phrase in the dismals.n. plural Mourning-garments.n. A name given in the southern Atlantic States, in the region bordering on the sea and sounds, and especially in North Carolina, to a tract of land, swampy in character, often covered by a considerable thickness of half-decayed wood and saturated with water.n. The devil.To feel dismal or melancholy.n. plural The blues; the dumps; a state of gloominess or despondency: as, to be in the dismals.