In a dark, dim, or obscure manner; in a way that is murky or hard to see or understand.
From Latin caliginosus (misty, dim), from caligo (darkness, mist). The -ous suffix creates an adjective, and -ly makes it an adverb. Used primarily in literary and formal contexts since the 18th century.
This word sounds exactly like what it means—say it aloud and you can almost feel the fog thickening. Latin words often carry their meaning in their sound, and caliginously is a perfect example of that.
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