mirthless (adjective) gloomy: feeling down, blue
Sinonime: barbaric, barbarous, bestial, brutal, cannibalistic, cold-blooded, cruel, devilish, diabolical, fell, ferocious, fiendish, fierce, grim, hateful, heartless, implacable, inhumane, malicious, malign, malignant, mean, merciless, pitiless, relentless, remorseless, ruthless,
savage, truculent, uncompassionate, unfeeling, unkind, unrelenting, unsympathetic, vicious, wolfish
Antonime: human