false vs what you see is what you get

false

verb
  • To incorrectly decode noise as if it were a valid signal. 

adv
  • In a dishonest and disloyal way; falsely. 

noun
  • One of two options on a true-or-false test. 

adj
  • Not essential or permanent, as parts of a structure which are temporary or supplemental. 

  • Out of tune. 

  • Based on factually incorrect premises. 

  • Used in the vernacular name of a species (or group of species) together with the name of another species to which it is similar in appearance. 

  • Untrue, not factual, factually incorrect. 

  • Uttering falsehood; dishonest or deceitful. 

  • Not well founded; not firm or trustworthy; erroneous. 

  • Spurious, artificial. 

  • Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous. 

what you see is what you get

proverb
  • The image corresponds to the reality. 

  • The screen image resembles the printed output. 

How often have the words false and what you see is what you get occurred in a corpus of books? (source: Google Ngram Viewer )