lacklustrous vs pococurante

lacklustrous

adj

  • Synonym of lackluster 

pococurante

adj

  • Apathetic, indifferent or nonchalant. 

noun

  • An apathetic, indifferent or nonchalant person. 

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