As an adjective untrue
As a noun falsity is
(countable) something that is false; an untrue assertion.
(countable) Something that is false; an untrue assertion.
:The belief that the world is flat is a falsity .
(uncountable) The characteristic of being untrue.
:The falsity of that statement is easily proven.
Instances may be quoted in abundance from old authors to show that the first three words are often strictly synonymous; but the modern tendency has been decidedly in favor of separating them, falsehood'' standing for the concrete thing, an intentional lie; ''falseness'', for the quality of being guiltily false or treacherous: as, he is justly despised for his ''falseness'' to his oath; and ''falsity'', for the quality of being false without blame: as, the ''falsity'' of reasoning. — the ''Century Dictionary , 1911.
* See also
* Oxford English Dictionary , second edition (1989)
* Random House Webster's Unabridged Electronic Dictionary (1987-1996)