Baleful means harmful, or expressing harmful intentions. a baleful look. + balefully bale·ful·ly He watched her balefully. expressing anger, hatred, or a wish to harm someone
threatening or foreshadowing evil or tragic developments; "a baleful look"; "forbidding thunderclouds"; "his tone became menacing"; "ominous rumblings of discontent"; "sinister storm clouds"; "a sinister smile"; "his threatening behavior"; "ugly black clouds"; "the situation became ugly"