pencil-necked vs pithless

pencil-necked

adj

  • Insubstantial; weak. 

  • Having a very thin neck. 

pithless

adj

  • Lacking strength or pith; weak. 

  • Not cogent. 

How often have the words pencil-necked and pithless occurred in a corpus of books? (source: Google Ngram Viewer )