desirable vs unvalued

desirable

noun
  • A thing that people want; something that is desirable. 

adj
  • Worthy to be desired; pleasing; agreeable. 

unvalued

adj
  • Not having been valued or appraised. 

  • Not considered to be of worth; deemed valueless. 

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