Did you
know?
Mendacious is a Latin form for "lying" or "untruthful."
It would be impolite or quite rude to call someone a "lying crook," but the Latinate equivalent "mendacious offender" could soften the effect.
As you can guess, the noun counterpart "mendacity" means "untruthfulness."
If you want to impress the person you are calling a crook, you might say, "You are so charming in your mendacity that no one really minds," or "You are so charming that no one really minds your mendacious fairy-tales."
Etymology: Latin mendax from Proto-Indo-European, mend- "physical defect, fault."
Interestingly, the word mendicant "beggar" from Latin "mendicus" also comes from mend-, where the original sense was "physical defect."
Synonyms:
artful, beguiling, clandestine, counterfeit, crafty, cunning, deceiving, deceptive, delusive, delusory, designing, disingenuous, double-dealing, duplicitous, fallacious, false ,foxy, fraudulent, furtive, guileful, hypocritical, illusory, impostrous, indirect, insidious, insincere, knavish, lying, mendacious, misleading, rascal, roguish, shifty, slick, sly, sneaky, stealthy, treacherous, tricky, two-faced, underhanded, untrustworthy, untruthful