unsincerity en · NOUN
Etymology
From un- + sincerity.
Meanings
-
(alt-of, obsolete, uncountable) Obsolete form of insincerity.
alt of insincerity
[…] I am novv ſatisfi'd, that a Spirit of Sea-ſalt may vvithout any unſincerity be ſo prepar'd as to diſſolve the body of crude Gold, though I could not find that the Solutions I made of that Metal vvere red, but rather of a yellovv or golden colour, much like thoſe made vvith common Aqua Regis.
1661, Robert Boyle, “[Two Essays, Concerning the Unsuccessfulness of Experiments, Containing Divers Admonitions and Observations (Chiefly Chymical) Touching that Subject.] The Second Essay, of Un-succeeding Experiments.”, in Certain Physiological Essays and Other Tracts; […], 2nd edition, London: […] Henry Herringman […], published 1669, →OCLC, pages 108–109: