adj. 25B6; adjective
a deceitful woman : DISHONEST, untruthful, mendacious, insincere, false, disingenuous, untrustworthy, unscrupulous, unprincipled, two-faced, duplicitous, double-dealing, underhand, crafty, cunning, sly, scheming, calculating, treacherous, Machiavellian; informal sneaky, tricky, foxy, crooked; Brit. informal bent.
a deceitful allegation : FRAUDULENT, counterfeit, fabricated, invented, concocted, made up, trumped up, untrue, false, bogus, fake, spurious, fallacious, deceptive, misleading; euphemistic economical with the truth.