thin as a wafer vs weakling

thin as a wafer

adj

  • Extremely thin. 

weakling

adj

  • weak, either physically, morally or mentally 

noun

  • A person of weak or even sickly physical constitution 

  • A person of weak character, lacking in courage and/or moral strength. 

How often have the words thin as a wafer and weakling occurred in a corpus of books? (source: Google Ngram Viewer )