second string vs sketchy

second string

adj
  • Not as good; of a lower quality or condition. 

noun
  • A unit of players which is considered to have a secondary level of talent and which usually plays after the first string. 

sketchy

adj
  • Of questionable or doubtful quality. 

  • Because he is so sketchy, I always think that he is up to something. 

  • Disturbing or unnerving, often in such a way that others may suspect them of intending physical or sexual harm or harassment. 

  • Not thorough or detailed. 

  • Roughly or hastily laid out; intended for later refinement. 

  • Resembling a comedy sketch, of sketch quality. 

  • Suspected of taking part in illicit or dishonorable dealings. 

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