1. Baleful adjective menacing, threatening, dangerous, frightening, evil, deadly, forbidding, intimidating, harmful, sinister, ominous, malignant, hurtful, vindictive, pernicious, mournful, malevolent, noxious, venomous, ruinous, intimidatory, minatory, maleficent, bodeful, louring or lowering, minacious He had a Baleful …