mistrust vs surmise

mistrust

verb
  • To suspect, to imagine or suppose (something) to be the case. 

  • To be suspicious. 

  • To have no confidence in (something or someone). 

  • To be wary, suspicious or doubtful of (something or someone). 

noun
  • Lack of trust or confidence; distrust, untrust. 

surmise

verb
  • To imagine or suspect; to conjecture; to posit with contestable premises. 

noun
  • Thought, imagination, or conjecture, which may be based upon feeble or scanty evidence; suspicion; guess. 

  • Reflection; thought; posit. 

How often have the words mistrust and surmise occurred in a corpus of books? (source: Google Ngram Viewer )