guarded vs mistrustful

guarded

adj
  • When the practitioner formulating the opinion does not have enough information to know, or to foretell, what the outcome may be. 

  • Cautious; restrained. 

  • Watched over; supervised. 

mistrustful

adj
  • Having a suspicion, imagining or supposing (that something undesirable is the case). 

  • Expressing or showing a lack of trust. 

  • Having mistrust, lacking trust (in someone or something). 

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