Falsity, n.;pl. Falsities.
Etymology: [L. falsitas: cf. F. fausseté, OF. also, falsité. See False, a.]
1. The quality of being false; coutrariety or want of conformity to truth. Probability does not make any alteration, either in the truth or falsity of things. South.
2. That which is false; falsehood; a lie; a false assertion. Men often swallow falsities for truths. Sir T. Brown.
Syn. -- Falsehood; lie; deceit. -- Falsity, Falsehood, Lie. Falsity denotes the state or quality of being false. A falsehood is a false declaration designedly made. A lie is a gross, unblushing falsehood. The falsity of a person's assertion may be proved by the evidence of others and thus the charge of falsehood be fastened upon him.
Shades of meaning
Fernald lists falsity only as an antonym, under veracity.
He lists it without comment; the entries above explain its neighbors.