noun
a state of darkness or obscurity
adjective
dark, dim, or misty
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The caliginous atmosphere of the cave made it difficult to see beyond a few feet.
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I couldn't find my way in the caliginous room without turning on the lights.
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The party was so caliginous, I could barely see who was there.
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His mind was in a caliginous state, clouded with confusion and doubt.