Akademik

menacing
adjective
threatening or foreshadowing evil or tragic developments (Freq. 1)
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a baleful look

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forbidding thunderclouds

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his tone became menacing

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ominous rumblings of discontent

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sinister storm clouds

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a sinister smile

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his threatening behavior

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ugly black clouds

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the situation became ugly

Syn:
baleful, ↑forbidding, ↑minacious, ↑minatory, ↑ominous, ↑sinister, ↑threatening
Similar to: ↑alarming
Derivationally related forms: ↑omen (for: ↑ominous), ↑balefulness (for: ↑baleful)

Useful english dictionary. 2012.