Another word for false
Said of persons
perfidious, faithless, treacherous, unfaithful, disloyal, dishonest, lying, untruthful, base, hypocritical, double-dealing, knavish, roguish, malevolent, rascally, scoundrelly, mean, malicious, venal, deceitful, mendacious, underhanded, corrupt, forsworn, unscrupulous, untrustworthy, falsehearted, dishonorable, villainous, treasonable, traitorous, seditious, canting, insincere, two-faced*; see also senses 2, 3.
Said of statements or supposed facts
untrue, mistaken, spurious, apocryphal, fanciful, mendacious, untruthful, fictitious, deceptive, concocted, fallacious, incorrect, inaccurate, wrong, sophistical, casuistic, Jesuitical, misleading, delusive, imaginary, illusive, erroneous, invalid, deceiving, misrepresentative, fraudulent, trumped-up, contrary to fact, fishy*, cooked-up*; see also senses 1, 3.
Said of things
sham, counterfeit, fabricated, manufactured, synthetic, factitious, bogus, spurious, make-believe, assumed, unreal, not genuine, copied, forged, pretended, faked, made-up, simulated, imitation, lifeless, pseudo, hollow, mock, feigned, bastard, base, shoddy, alloyed, artificial, contrived, colored, disguised, deceptive, adulterated, plated, so-called, meretricious, fake, ersatz, phony*, gyp*, catchpenny*, bum*, false-colored*, queer*, not what it's cracked up to be*; see also senses 1, 2.
false, in this comparison, refers to anything that is not in essence that which it purports to be and may or may not connote deliberate deception false hair, false eyelashes; sham refers to an imitation or simulation of something and usually connotes intent to deceive sham piety; counterfeit and the colloquial bogus apply to a very careful imitation and always imply intent to deceive or defraud counterfeit, or bogus, money; fake is a less formal term for any person or thing that is not genuine a fake doctor, chimney, etc. See also syn. study at faithless.play someone false
Another word for falseadjective
Devoid of truth:counterfactual, specious, spurious, truthless, untrue, untruthful, wrong. See true
Containing an error or errors:erroneous, fallacious, inaccurate, incorrect, mistaken, off, unsound, untrue, wrong. Idioms: all wet, in error, off base, off (or wide of) the mark. See correct
Containing fundamental errors in reasoning:fallacious, illogical, invalid, sophistic, specious, spurious, unsound. See correct, true
Fraudulently or deceptively imitative:bogus, counterfeit, fake, fraudulent, phony, sham, spurious, suppositious, supposititious. See true
Not true to duty or obligation:disloyal, faithless, false-hearted, perfidious, recreant, traitorous, treacherous, unfaithful, untrue. See continue, trust