asthenic vs vigorous

asthenic

adj

  • Characterized by, or pertaining to, debility; weak; debilitating. 

noun

  • A person who has asthenia. 

vigorous

adj

  • Mentally strong and active. 

  • Rapid of growth. 

  • Physically strong and active. 

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