noun
no applicable parts of speech
adjective
dark; shadowy; obscure
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The tenebrous atmosphere of the cave made it difficult to see beyond a few feet.
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I don't like walking through that tenebrous alley at night, it gives me the creeps.
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The tenebrous vibes at that party were too much for me, I had to leave early.
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His tenebrous thoughts clouded his judgment, leading to poor decision-making.