obtuse vs straightedge

obtuse

adj
  • Intellectually dull or dim-witted. 

  • Blunt; not sharp, pointed, or acute in form. 

  • Obtuse-angled, having an obtuse angle. 

  • Blunt, or rounded at the extremity. 

  • Of sound, etc.: deadened, muffled, muted. 

  • Indirect or circuitous. 

  • Larger than one, and smaller than two right angles, or more than 90° and less than 180°. 

straightedge

adj
  • Living one's life opposing or eschewing the use of substances such as alcohol, tobacco, and drugs. 

noun
  • A flat, rectangular tool used to draw, cut or check the straightness of straight lines. 

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