supineness vs unenthusiasm

supineness

noun
  • The state of being supine. 

  • Total submissiveness; flat on one's back, lacking any backbone; with total abandon; prostrate; supine 

unenthusiasm

noun
  • Lack of enthusiasm. 

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