Obtuse (adjective)

Not sharp or pointed; not acute; blunt; dull; lacking quickness of perception or intellect.

Origin:

From latin obtusus, from obtundere "to blunt".

Examples:

1. The angle is obtuse.
2. He has an obtuse perception of the situation.
3. The triangle has one obtuse angle.
4. He was criticized for being obtuse.
5. His comment was obtuse and not helpful.