"baleful" in the adjective sense
1. baleful, baneful
deadly or sinister
"the Florida eagles have a fierce baleful look"
2. baleful, forbidding, menacing, minacious, minatory, ominous, sinister, threatening
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"
Source: WordNet® (An amazing lexical database of English)
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