desirable vs disease-free

desirable

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

adj
  • Worthy to be desired; pleasing; agreeable. 

disease-free

adj
  • free of disease, not having, carrying, or suffering from any disease. 

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