cowardly vs martial

cowardly

adj
  • Showing cowardice; lacking in courage; weakly fearful. 

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 cowardly and martial occurred in a corpus of books? (source: Google Ngram Viewer )