Laodicean vs couldn't-care-less

Laodicean

noun
  • Somebody from Laodicea 

adj
  • lukewarm, neither hot nor cold (with reference to Revelation 3:16) 

  • pertaining to Laodicea 

  • half-hearted or apathetic, especially with regards to religion or politics 

couldn't-care-less

How often have the words Laodicean and couldn't-care-less occurred in a corpus of books? (source: Google Ngram Viewer )