The quality or state of being dark, dim, obscure, or hard to see or understand; murkiness.
From caliginous + -ness suffix, creating a noun that denotes the abstract quality. Built from Latin caligo with English suffixes to describe the state of obscurity.
English loves building bigger words from smaller ones—we take caligo (Latin for fog), add -ous (adjective), add -ly (adverb), then add -ness (noun), and end up describing the quality of being foggy.
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