adjective
a word that describes or gives more information about a noun or pronoun; in this case, 'menacing' describes something that is threatening or suggesting danger
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The menacing storm clouds loomed overhead, threatening to unleash a downpour at any moment.
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I saw a menacing looking guy hanging around the corner.
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That dude had a real menacing vibe about him.
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The silence in the room was so thick and menacing, you could cut it with a knife.