1. The coroner's report said that he had been beaten to death with some kind of obtuse instrument.
2. dull; stupid
2. Even a highly intelligent person can become obtuse when he is under the influence of some very powerful emotion, such as love or fear.
ob (against)#tudere (to beat) (Latin)
imagine a pencil tip. the more obtuse the angle between the two edges of the tip. the more blunt the tip is. obtuse refers to angles between two lines which is >90 degrees. the line appears like its leaning towards the wall which is inactive and stupid