dubious vs suspect

dubious

adj
  • Arousing doubt; questionable; open to suspicion. 

  • In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided. 

  • Generally considered imprecise or wrong, but not totally unplayable. 

suspect

adj
  • Viewed with suspicion; suspected. 

  • Viewing with suspicion; suspecting. 

verb
  • To have suspicion. 

  • To imagine or suppose (something) to be true, or to exist, without proof. 

  • To believe (someone) to be guilty. 

  • To distrust or have doubts about (something or someone). 

noun
  • A person who is suspected of something, in particular of committing a crime. 

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