third string vs unequal

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. 

unequal

adj
  • Inadequate; insufficiently capable or qualified. 

  • Not the same. 

  • Out of balance. 

  • Erratic, inconsistent. 

noun
  • One who is not an equal. 

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