Adjective false has 10 senses
  1. false - not in accordance with the fact or reality or actuality; "gave false testimony under oath"; "false tales of bravery"
    true, actual, genuine, literal, real, apodictic, apodeictic, factual, so, truthful, sure
  2. false, mistaken - arising from error; "a false assumption"; "a mistaken view of the situation"
    Antonyms: correct, right (indirect, via incorrect, wrong)
    Antonyms: correct, right (indirect, via incorrect, wrong)
  3. false - erroneous and usually accidental; "a false start"; "a false alarm"
    valid (indirect, via invalid)
  4. false, hollow - deliberately deceptive; "hollow (or false) promises"; "false pretenses"
    Antonym: sincere (indirect, via insincere)
  5. delusive, false - inappropriate to reality or facts; "delusive faith in a wonder drug"; "delusive expectations"; "false hopes"
    Antonym: realistic (indirect, via unrealistic)
  6. fake, false, faux, imitation, simulated - not genuine or real; being an imitation of the genuine article; "it isn't fake anything; it's real synthetic fur"; "faux pearls"; "false teeth"; "decorated with imitation palm leaves"; "a purse of simulated alligator hide"
    Antonym: natural (indirect, via artificial)
  7. false - designed to deceive; "a suitcase with a false bottom"
    honest, honorable (indirect, via dishonest)
  8. false, off-key, sour - inaccurate in pitch; "a false (or sour) note"; "her singing was off key"
    Antonym: harmonious (indirect, via inharmonious)
  9. assumed, false, fictitious, fictive, pretended, put on, sham - adopted in order to deceive; "an assumed name"; "an assumed cheerfulness"; "a fictitious address"; "fictive sympathy"; "a pretended interest"; "a put-on childish voice"; "sham modesty"
    Antonyms: genuine, echt (indirect, via counterfeit)
  10. false, untrue - (used especially of persons) not dependable in devotion or affection; unfaithful; "a false friend"; "when lovers prove untrue"
    Antonym: constant (indirect, via inconstant)
,Adverbial false has 1 sense
  1. faithlessly, traitorously, treacherously, treasonably, false - in a disloyal and faithless manner; "he behaved treacherously"; "his wife played him false"