WordReference Random House Learner's Dictionary of American English © 2017
false /fɔls/USA pronunciation   adj.,  fals•er, fals•est. 
  1. not true or correct;
    erroneous;
    wrong:a false statement.
  2. uttering or declaring what is untrue;
    lying:a false witness.
  3. not faithful or loyal:a false friend.
  4. tending to deceive or mislead;
    deceptive:a false impression.
  5. not genuine;
    counterfeit:[before a noun]a false name.
  6. not real;
    used as a substitute or aid, esp. temporarily;
    artificial:[before a noun]false teeth.
  7. based on mistaken, erroneous, or inconsistent impressions, ideas, or facts:[before a noun]false pride.
  8. wrong or not correct in pitch, such as a musical note:[before a noun]He played several false notes.
false•ly, adv. 
false•ness, n. [uncountable]
    false is an adjective, falseness and falsity are nouns, falsify is a verb, falsely is an adverb:His nervousness created a false impression during the job interview. She was discouraged by his falseness and cowardice. There was a good deal of falsity in the papers. He tried to falsify his passport. He was falsely accused of the murder.

WordReference Random House Unabridged Dictionary of American English © 2017
false  (fôls),USA pronunciation adj.,  fals•er, fals•est, adv. 
adj. 
  1. not true or correct;
    erroneous:a false statement.
  2. uttering or declaring what is untrue:a false witness.
  3. not faithful or loyal;
    treacherous:a false friend.
  4. tending to deceive or mislead;
    deceptive:a false impression.
  5. not genuine;
    counterfeit.
  6. based on mistaken, erroneous, or inconsistent impressions, ideas, or facts:false pride.
  7. used as a substitute or supplement, esp. temporarily:false supports for a bridge.
  8. Biologyhaving a superficial resemblance to something that properly bears the name:the false acacia.
  9. not properly, accurately, or honestly made, done, or adjusted:a false balance.
  10. inaccurate in pitch, as a musical note.

adv. 
  1. dishonestly;
    faithlessly;
    treacherously:Did he speak false against me?
  2. Idiomsplay someone false, to betray someone;
    be treacherous or faithless.
falsely, adv. 
falseness, n. 
  • Latin
  • Latin falsus feigned, false, origin, originally past participle of fallere to deceive; reinforced by or reborrowed from Anglo-French, Old French fals, feminine false
  • Middle English, Old English fals bef. 1000
    • 1.See corresponding entry in Unabridged mistaken, incorrect, wrong, untrue.
    • 2.See corresponding entry in Unabridged untruthful, lying, mendacious.
    • 3.See corresponding entry in Unabridged insincere, hypocritical, disingenuous, disloyal, unfaithful, inconstant, perfidious, traitorous.
    • 4.See corresponding entry in Unabridged misleading, fallacious.
    • 5.See corresponding entry in Unabridged artificial, spurious, bogus, forged.
      False, sham, counterfeit agree in referring to something that is not genuine.
      False is used mainly of imitations of concrete objects;
      it sometimes implies an intent to deceive:false teeth; false hair.Sham is rarely used of concrete objects and usually has the suggestion of intent to deceive:sham title; sham tears.Counterfeit always has the implication of cheating;
      it is used particularly of spurious imitation of coins, paper money, etc.

'falsely' also found in these entries:
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