disagreeable vs unpleasantness

disagreeable

noun
  • Something or someone displeasing; anything that is disagreeable. 

adj
  • Causing repugnance; unpleasant to the feelings or senses; displeasing. 

unpleasantness

noun
  • The property of being unpleasant or disagreeable. 

  • An unpleasant behaviour, occurrence, etc. 

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