clouded vs understandable

clouded

adj
  • Variegated with spots. 

  • Made dim or blurry. 

  • Filled with clouds. 

  • Unclear; surrounded in mystery. 

understandable

adj
  • Capable of being accepted or excused under the circumstances. 

  • Capable of being understood; comprehensible. 

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