thiefy vs untruthful

thiefy

adj
  • Like a thief; thievish; thieving 

untruthful

adj
  • Pertaining to falsehood; corrupt; dishonest. 

  • Not giving the truth; providing untrue facts; lying. 

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