Synonyms of false

1 Syllable
faux, wrong, quack, mock, shams, sham
2 Syllables
made-up, disloyal, off-base, groundless, artier, shamming, unapt, floater, unreal, misborn, shamer, faithless, forced, arty, crocker, pseudo, man-made, bastard, untrue, strained, truthless, wronging, wronger, fluffed, wrongest, unloyal, specious, feigned, wrecker, quacker, flawed, mythic, faultier, spurious, ersatz, mocker, bogus, unsound, recreant, way-off, amiss, faulty, lying, jivey
3 Syllables
deceitful, casuistic, trumped-up, sophistic, pretended, mythical, invalid, unfitting, unbacked, insidious, phoniness, socalled, fictitious, counterfeit, synthetic, contrived, folkloric, vicarial, libelous, improper, dishonest, manmade, misleading, ill-founded, uncandid, invented, disguised, factitious, moonlighting, reasonless, incorrect, erroneous, mistaken, treacherous, assumed, perjurious, hollywood, perfidious, pharisaic, mendacious, foresworn, untruthful, storybook, cooked-up, unfounded, pecksniffian, unfaithful
4 Syllables
untrustworthy, illusive, illusory, delusive, make-believe, unreliable, unconforming, substituted, out-of-place, out-of-season, unbefitting, substitute, ungenuine, unnatural, mythologic, falsehearted, apocryphal, deceptive, counterfeited, false-hearted, counterfactual, misfigured, artificial, sophistical, pseudonymous, sanctimonious, aspersive, evasive, imprecise, insincere, substituting, unauthentic, pigeonhearted, imposturous, illogical, barmecidal, insubstantial, disingenuous, casuistical, delusory, unconverted, pharisaical, unspontaneous
5 Syllables
inapposite, mythological, substitutive, calumniatory, unretentive, adulterine, hypocritical, inaccurate, exaggerated
6 Syllables
unauthenticated