impenetrable vs leptosome

impenetrable

noun
  • A person not openly given to friendship. 

adj
  • Opaque; obscure; not translucent or transparent. 

  • Not penetrable. 

  • Incomprehensible; fathomless; inscrutable. 

leptosome

noun
  • A tall, narrow-bodied, angular person. 

adj
  • Narrow-bodied (in proportional to height or length). 

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