untrustworthy vs what you see is what you get

untrustworthy

adj

  • Not deserving of trust; unreliable. 

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 untrustworthy and what you see is what you get occurred in a corpus of books? (source: Google Ngram Viewer )