dependable vs unfrequent

dependable

noun
  • A reliable person or thing. 

adj
  • Able, or easily able to be depended on. 

unfrequent

adj
  • Not frequent; not common; not happening often; infrequent. 

verb
  • To stop frequenting; cease to frequent. 

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