[ob.tuse] adj ob.tus.er ; -est [ME, fr. L obtusus blunt, dull, fr. pp. of obtundere to beat against, blunt, fr. ob- against + tundere to beat--more at ob-, contusion] (15c) 1 a: not pointed or acute: blunt b (1) of an angle: exceeding 90 degrees but less than 180 degrees (2): having an obtuse angle "an ~ triangle"--see triangle illustration c of a leaf: rounded at the free end
2. a: lacking sharpness or quickness of sensibility or intellect: insensitive, stupid b: difficult to comprehend: not clear or precise in thought or expression syn see dull -- ob.tuse.ly adv -- ob.tuse.ness n