menacing

Adjective
  1. Threatening or foreshadowing evil or tragic developments (synset 300195958)
    "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"
    similar to: alarming - frightening because of an awareness of danger
    same as: baleful, forbidding, minacious, minatory, ominous, sinister, threatening

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