edentate vs ineffectual

edentate

adj
  • Lacking teeth. 

  • Belonging to the Edentata. 

noun
  • Any mammal that has few or no teeth, but especially the anteaters, armadillos, and sloths of the former order Edentata. 

ineffectual

adj
  • Weak, indecisive; lacking forcefulness. 

  • Unable or insufficient to produce effect. 

  • Worthless; ineffective. 

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