circular vs tortuous

circular

adj
  • Circuitous or roundabout. 

  • Referring back to itself, so as to prevent computation or comprehension; infinitely recursive. 

  • Of or relating to a circle. 

  • Distributed to a large number of persons. 

  • In the shape of, or moving in a circle. 

verb
  • To extend in a circular direction. 

  • To distribute circulars to or at. 

noun
  • Synonym of flyer: a printed advertisement, directive, or notice intended for mass circulation. 

  • A shuttle bus with a circular route. 

tortuous

adj
  • Twisted; having many turns; convoluted. 

  • Oblique; applied to the six signs of the zodiac (from Capricorn to Gemini) that ascend most rapidly and obliquely. 

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