An obtuse triangle is a geometrical shape that has one angle of greater than 90 degrees. There are several different synonyms that can be used to describe this shape, including a blunt triangle, a wide-angle triangle, a flat triangle, and a dull triangle. Each of these synonyms helps to convey the same idea as an obtuse triangle, but with slightly different connotations. For example, a blunt triangle might suggest that the angle is not sharp or pointed, while a wide-angle triangle might convey the sense of a broader or more open shape. Ultimately, each of these synonyms helps to give a more specific and descriptive meaning to this fundamental geometric shape.