niggly vs nitty

niggly

adj
  • Bad-tempered, especially about trivial details. 

  • Trivial, insignificant 

  • Pernickety, paying too much attention to small details. 

nitty

adj
  • Foolish, inane. 

  • Of a poker player: playing in an overly cautious and reactive manner. 

  • detailed or specific; fastidious, fussy, nit-picky. 

noun
  • A dope fiend, a druggie. 

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