FluentPlex

false

/fɔls/ adjective A1
  1. Untrue, not factual, factually incorrect.
  2. Based on factually incorrect premises. · false legislation, false punishment
  3. Spurious, artificial. · false teeth
  4. Of a state in Boolean logic that indicates a negative result.
  5. Uttering falsehood; dishonest or deceitful. · a false witness
  6. Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous. · a false friend, lover, or subject; false to promises
  7. Not well founded; not firm or trustworthy; erroneous. · a false conclusion; a false construction in grammar
  8. Not essential or permanent, as parts of a structure which are temporary or supplemental.

Comparative falser · Superlative falsest

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From the library

Now this could only be done by having a false key—”
Sherlock Holmes: The Bruce-Partington Plans, p. 11 · B2
“Several false keys.
Sherlock Holmes: The Bruce-Partington Plans, p. 11 · B2
“He had, then, several false keys.
Sherlock Holmes: The Bruce-Partington Plans, p. 11 · B2
A false tale often betrays itself.
Three Hundred Aesop's Fables, p. 69 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.