The term "obtuse" can describe an angle that is greater than 90 degrees but less than 180 degrees. In geometry, an obtuse angle appears wide and open, making it different from sharp angles, which are less than 90 degrees. For example, in a triangle, if one angle is obtuse, the triangle is classified as an obtuse triangle. In everyday language, "obtuse" can also refer to someone who is slow to understand or perceive things. If a person is being obtuse, they might miss obvious points in a conversation or fail to grasp a simple idea. This usage highlights a lack of sharpness in thinking or awareness.