exasperating vs irksome

exasperating

adj
  • That exasperates, infuriates, annoys or irritates 

irksome

adj
  • Marked by irritation or annoyance; disagreeable; troublesome by reason of long continuance or repetition 

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