false

/fɔ:ls/
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false

A friend who lies to you is a false friend.

Definition
  1. Adjective:

    • Not true or correct; wrong: "false" describes something that is not in accordance with fact, truth, or reality.
    • Not genuine; artificial or imitation: "false" refers to something made to look real but is not authentic.
    • Based on mistaken ideas: "false" can describe beliefs, hopes, or assumptions that are incorrect.
    • Deliberately deceptive or dishonest: "false" indicates an intent to mislead or betray.
    • Not faithful or loyal: "false" describes a person who is insincere or treacherous in affection or allegiance.
    • Inaccurate in musical pitch: "false" describes a note that is off-key or out of tune.
  2. Adverb:

    • In a treacherous or dishonest manner: "false" describes acting with disloyalty or deceit.
Usage Examples
  • Adjective:

    • He gave false testimony in court. (His statement was not true.)
    • She was wearing false eyelashes. (The eyelashes were artificial, not real.)
    • The rumor turned out to be false. (The rumor was incorrect.)
    • He is a false friend. (He is not a loyal or dependable friend.)
    • The singer hit a false note. (The musical note was off-pitch.)
  • Adverb:

    • He swore to help but then played me false. (He acted in a treacherous way toward me.)
Advanced Usage
  • "under false pretences": by pretending to be something one is not, or by lying about one's intentions.
    • He obtained the money under false pretences.
  • "false alarm": a warning or signal that is given mistakenly, causing unnecessary alarm.
    • The fire evacuation was a false alarm.
  • "false start": an attempt to begin something that is invalidated by an error or premature action.
    • The race had two false starts.
Variants and Related Words
  • Falsify (verb): to alter information so as to mislead; to make false.
    • He tried to falsify the documents.
  • Falsity (noun): the state of being untrue.
    • The falsity of the claim was obvious.
  • Falsehood (noun): a lie; the state of being untrue.
    • He was accused of spreading falsehoods.
Synonyms
  • Incorrect: not accurate or true.
  • Fake: not genuine; imitation.
  • Untrue: not in accordance with fact.
  • Deceptive: intended to mislead.
  • Treacherous: guilty of betrayal.
Related Phrases and Phrasal Verbs
  • To prove false: to be shown to be incorrect or untrue.
    • His theory was proven false by new evidence.
  • To play someone false: to betray or deceive someone.
    • I trusted him, but he played me false.
Related Idioms
  • A false economy: something that seems to save money but actually costs more in the long run.
    • Buying cheap tools is often a false economy.
  • Sail under false colors: to pretend to be something one is not; to deceive.
    • The company was sailing under false colors, claiming to be eco-friendly.
false

A friend who lies to you is a false friend.

Adjective
  1. (used especially of persons) not dependable in devotion or affection; unfaithful
    • a false friend
    • when lovers prove untrue
  2. 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
  3. inaccurate in pitch
    • a false (or sour) note
    • her singing was off key
  4. designed to deceive
    • a suitcase with a false bottom
  5. not genuine or real; being an imitation of the genuine article; it's real synthetic fur"
    • it isn't fake anything
    • faux pearls
    • false teeth
    • decorated with imitation palm leaves
    • a purse of simulated alligator hide
  6. inappropriate to reality or facts
    • delusive faith in a wonder drug
    • delusive expectations
    • false hopes
  7. deliberately deceptive
    • false pretenses
  8. erroneous and usually accidental
    • a false start
    • a false alarm
  9. arising from error
    • a false assumption
    • a mistaken view of the situation
  10. not in accordance with the fact or reality or actuality
    • gave false testimony under oath
    • false tales of bravery
Adverb
  1. in a disloyal and faithless manner
    • he behaved treacherously
    • his wife played him false