[f. UNKNOWN a.] The quality of being unknown.

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1619.  W. Sclater, Exp. 1 Thess. (1630), 398. The vnknownnesse, and suddennesse of Christs comming.

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1675.  trans. Camden’s Hist. Eliz. (ed. 3), II. 252. They stood in no Fear at all of Pirates, by reason of … the Unknownness of that Sea.

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1864.  N. Hawthorne, S. Felton (1883), 383. Soon they would all drop away,… all leaving him in blessed unknownness to adopt new temporary relations.

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1899.  Outlook, 15 April, 364/2. Her studies … appeal by the very unknownness to English readers.

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