obtuse vs pure

obtuse

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

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

  • Intellectually dull or dim-witted. 

  • Obtuse-angled, having an obtuse angle. 

  • Blunt, or rounded at the extremity. 

  • Indirect or circuitous. 

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

pure

adj
  • Of a single, simple sound or tone; said of some vowels and the unaspirated consonants. 

  • Free of foreign material or pollutants. 

  • Free of flaws or imperfections; unsullied. 

  • Done for its own sake instead of serving another branch of science. 

  • Mere; that and that only. 

  • Without harmonics or overtones; not harsh or discordant. 

  • A lot of. 

  • Free of immoral behavior or qualities; clean. 

adv
  • to a great extent or degree; extremely; exceedingly. 

verb
  • to hit (the ball) completely cleanly and accurately 

noun
  • One who, or that which, is pure. 

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