maladjustment vs neurasthenia

maladjustment

noun
  • The inability to adapt oneself to the needs of others, or to the stresses of normal life. 

  • A poor or faulty adjustment, especially of a mechanism. 

neurasthenia

noun
  • An ill-defined medical condition characterized by lassitude, fatigue, headache, and irritability, associated chiefly with emotional disturbance. 

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