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The Collaborative International Dictionary
Caliginousness

Caliginous \Ca*lig"i*nous\, a. [L. caliginosus; cf. F. caligineux.] Affected with darkness or dimness; dark; obscure. [R.]
--Blount.

The caliginous regions of the air.
--Hallywell. -- Ca*lig"i*nous*ly, adv. -- Ca*lig"i*nous*ness, n. [1913 Webster] ||

Wiktionary
caliginousness

n. The state or quality of being caliginous.