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Webster 1913 Edition

Adj.

Incessant.

[Obs.]

Dr. H. More.

–

Un-ces′sant-ly

adv.

[Obs.]

Adj.

Continual; incessant. [The latter is the word now used.]

uncessant ‎(comparative more uncessant, superlative most uncessant)

Obsolete form of incessant.
(Can we find and add a quotation of Dr. H. More to this entry?)