Type of angle greater than 90 degrees but less than 180 (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
obtuse
(Other definitions for obtuse that I've seen before include "Thick, blunt" , "(Of angle) between 90° and 180° - dull" , "Can't quite see the angle" , "Blunt, not sharp or pointed" , "To be thus blunt" .)