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:
• Similar to: ↑alarming
Useful english dictionary. 2012.