bothersome vs irksome

bothersome

adj
  • Causing trouble, annoyance, inconvenience, irritation, or perplexity. 

irksome

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

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