brittleness vs debilitation

brittleness

noun
  • The state of being brittle; aptness to break; fragility. 

  • The property by virtue of which a material is fractured without appreciable deformation by the application of load. 

debilitation

noun
  • The act or process of debilitating, or the condition of one who is debilitated; weakness. 

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