faulty vs third string

faulty

adj
  • Having or displaying faults; not perfect; not adequate or acceptable. 

third string

adj
  • Of a decidedly lower quality or condition. 

noun
  • A unit of players that plays behind the first and second strings; a junior varsity team. 

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