bale·ful 
/ˈbeɪlfəl/ adjective
/ˈbeɪlfəl/ adjective [more baleful; most baleful] formal 1 : threatening harm or evil
▪ He turned and gave us a baleful [=sinister] glance/glare/look. 2 : harmful or deadly
▪ the baleful effects/consequences of water pollution
▪ He turned and gave us a baleful [=sinister] glance/glare/look.
▪ the baleful effects/consequences of water pollution
— bale·ful·ly adverb
▪ He stared balefully at his opponent.
▪ He stared balefully at his opponent.
