laid-back vs martial

laid-back

adj
  • relaxed and easy-going; an absence of stress or worry 

martial

adj
  • Connected with or relating to armed forces or the profession of arms or military life. 

  • Characteristic of or befitting a warrior; having a military bearing; soldierly. 

  • Of, relating to, or suggestive of war; warlike. 

How often have the words laid-back and martial occurred in a corpus of books? (source: Google Ngram Viewer )