What is the meaning of false?

adjective

• Not in accordance with the fact or reality or actuality.
  • usage: "gave false testimony under oath"; "false tales of bravery"
• Arising from error.
  • usage: "a false assumption"; "a mistaken view of the situation"
  • synonyms: mistaken
• Erroneous and usually accidental.
  • usage: "a false start"; "a false alarm"
• Deliberately deceptive.
  • usage: "false pretenses"
• Inappropriate to reality or facts.
  • usage: "delusive faith in a wonder drug"; "delusive expectations"; "false hopes"
  • synonyms: delusive
• Not genuine or real; being an imitation of the genuine article.
  • usage: "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"
  • synonyms: fake, faux, imitation, simulated
• Designed to deceive.
  • usage: "a suitcase with a false bottom"
• Inaccurate in pitch.
  • usage: "a false (or sour) note"; "her singing was off key"
  • synonyms: off-key, sour
• Adopted in order to deceive.
  • usage: "an assumed name"; "an assumed cheerfulness"; "a fictitious address"; "fictive sympathy"; "a pretended interest"; "a put-on childish voice"; "sham modesty"
  • synonyms: assumed, fictitious, fictive, pretended, put on, sham
• Used especially of persons. ( not dependable in devotion or affection; unfaithful)
  • usage: "a false friend"; "when lovers prove untrue"
  • synonyms: untrue

adverb

• In a disloyal and faithless manner.
  • usage: "he behaved treacherously"; "his wife played him false"
  • synonyms: faithlessly, traitorously, treacherously, treasonably