ruthful vs unfelicitous

ruthful

adj
  • Causing pity; piteous. 

  • Full of ruth or pity; merciful; compassionate. 

  • Full of sorrow; sorrowful; woeful; rueful. 

unfelicitous

adj
  • Not felicitous; unhappy, unfortunate. 

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