Portending evil; ominous. See synonyms at sinister
Harmful or malignant in intent or effect.
derivatives
baléful·ly
adverb
baléful·ness
noun
usage note
Usage Note: Baleful and baneful overlap in meaning, but baleful usually applies to something that is menacing or foreshadows evil: a baleful look. Baneful most often describes that which is actually harmful or destructive: baneful effects of their foreign policy.
The American Heritage® Dictionary of the English Language, Fourth Edition