lacking sensitivity or mental alertness
said of an angle: greater than 90° but less than 180°
said of a triangle: having an obtuse angle
not pointed or acute
said of a leaf: rounded at the end furthest from the stalk
obtusely adv
obtuseness noun
[Latin obtusus blunt, dull, past part. of obtundere to beat against, blunt, from ob- + tundere to beat]