In common use from about 1795.
1784. Cowper, Task, V. 653. In the deed, The unequivocal authentic deed, We find sound argument.
1791. Newte, Tour Eng. & Scot., 236. In the Highlands … men of years … are struck with the most unequivocal proofs of depopulation.
1838. Thirlwall, Greece, xlii. V. 213. He … aided him in several acts of unequivocal hostility against his country.
1858. Sears, Athan., III. v. 294. This is here asserted by the Apostle in most unequivocal language.
1871. Earle, Philol. Eng. Tongue, 340. An adjectival form which should be unequivocal.
Hence Unequivocalness.
1846. Worcester (citing Godwin).
