indubious vs palpable

indubious

adj
  • Not doubting; unsuspecting. 

  • Not dubious or doubtful; certain. 

palpable

adj
  • Obvious or easily perceived; noticeable. 

  • That can be detected by palpation. 

  • Capable of being touched, felt or handled; touchable, tangible. 

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