disingenuity means synonym of disingenuousness. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From dis- + ingenuity.
noun
- Synonym of disingenuousness.“[…]it was only his Obſervation of the Diſingenuity, and want of Integrity in this Parliament, which leſſened that Reverence to it,[…]”