mendacity

The fact or condition of being untruthful; dishonesty.

Mendacity is not a uniform offence: it changes its colour according to the nature and substance of the offence to which it is rendered or endeavoured to be rendered subservient. Mendacity, employed in drawing down upon an innocent head the destroying sword of justice, is murder: murder, encompassed with all its correspondent terror. Mendacity, employed in the obtainment of money, is but depredation. Yet, while predatory mendacity is punished with death, the punishment for the murderous mendacity is in comparison but a flea-bite.

[…] Treating the assertion of the witness as the effect, he [Pierre-Simon Laplace] considers as its two possible causes, the veracity or mendacity of the witness on the particular occasion, that is, the truth or falsity of the fact.

A deceit, falsehood, or lie.

The scandalous bronze-lacker age, of hungry animalisms, spiritual impotencies and mendacities, will have to run its course, till the Pit swallow it.

Though the rebels had utterly failed in their purposes, having accomplished nothing but the temporary disabling of two lightly armed vessels, and had retreated before the approach of the only formidable vessel there, they formally, and with a mendacity equalled only by some of their own efforts in that direction, proclaimed that they had "driven out of sight, for a time, the entire hostile fleet," and that the blockade of the port of Charleston was raised.