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Definition of false : 1. Not according with truth or reality; not true; fitted or likely to deceive or disappoint; as, a false statement.
2. Not essential or permanent, as parts of a structure which are temporary or supplemental.
3. Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous; perfidious; as, a false friend, lover, or subject; false to promises.
4. Not genuine or real; assumed or designed to deceive; counterfeit; hypocritical; as, false tears; false modesty; false colors; false jewelry.
5. Not in tune.
6. Not truly; not honestly; falsely.
7. Not well founded; not firm or trustworthy; erroneous; as, a false claim; a false conclusion; a false construction in grammar.
8. To betray; to falsify.
9. To feign; to pretend to make.
10. To mislead by want of truth; to deceive.
11. To report falsely; to falsify.
12. Uttering falsehood; unveracious; given to deceit; dishnest; as, a false witness.

Synonyms:

dishonorable, shoddy, trust, ill-considered, bastard, senseless, pretended, foolish, treacherously, simulated, deceive, questionable, unsound, sugary, untruthful, queer, recreant, corrupt, turned, monstrous, defrauding, supposed, man-made, base, dour, treasonable, substitute, anecdotal, lying, double-dealing, ill-advised, roughly, unscrupulous, moody, unfounded, invalid, dark, delusive, imaginary, faithlessly, malicious, apparently, mechanical, allegedly, ridiculous, alloyed, forsworn, ill-judged, supposititious, so-called, unrealistic, venal, glum, malevolent, anomalous, unreasonable, roguish, disloyal, feigned, put on, imprecise, fickle, approximate, fictitious, mean, fabricated, morose, sullen, faithful, fictive, canting, stupid, pretend, mimic, hypocritical, make-believe, insincere, nonsensical, specious, knavish, continue, imitative, mendacious, unauthentic, faithless, rascally, villainous, rancid, misguided, wild, trumped-up, meretricious, dummy, counterfactual, hypothetical, inauthentic, doubtful, true, made-up, traitorously, inconstant, disguised, treasonably, snide, treacherous, bum, inconclusive, suppositious, adulterated, delusory, manufactured, correct, false-hearted, unfaithful, lifeless, untrustworthy, absurd, strained, inharmonious, genuine, spurious, betray, fishy, sophistic, approximately, accurate, sour, two-faced, broadly, seditious, traitorous, seemingly, misleading, assumed, phoney, contrived, speculative, alleged, paradoxical, infatuated, out of true, colored, real, beguiling, off-key, faux, apocryphal, unharmonious, fanciful, gyp, disingenuous, hollow, sham, preposterous, authentic, deceiving, off, copied, ludicrous, trick, underhanded, chimerical, fancied, unsubstantiated, inexact, factitious, illusive, pseudo, plastic, saturnine, irrational, glowering, perfidious, unreal

illogical, misconceived, botched, misjudged, miscalculated, distorted, defective, misestimated, marred, misconstrued

fraudulent, masquerading, facade, studied, forced, imposture, bogus, ostentatious, ersatz, unnatural, affected, impersonating, counterfeit, deceitful, synthetic, showy, histrionic, theatrical, mannered, posing, imitation, pretentious, la-di-da, artificial, forged, fake, stagy, stiff, overdone, mock, stilted

bad, untrue, faulty, inaccurate, flawed, illegal, wrong, incorrect, improper, mistaken, aberrant, erroneous, fallacious

deluding, dishonest, deceptive, crooked, fictional, truthless, phony

Usage examples:

• And heart more false! - "The Complete Poetical Works of Henry Wadsworth Longfellow", Henry Wadsworth Longfellow.
• So true that she died because she was false." - "The Virgin of the Sun", H. R. Haggard.
• He would be false to the end, of course. - "The Sea-Hawk", Raphael Sabatini.