Which term describes a triangle that has no congruent sides or angles?

A triangle that has no congruent sides or angles is defined as a scalene triangle. In a scalene triangle, each side is of a different length, and each angle is of a different measure, making it distinct from the other types of triangles.

For instance, an isosceles triangle features at least two sides that are of equal length, which means it has at least two congruent angles as well. Similarly, an equilateral triangle has three sides that are all equal in length, leading to three angles that are all the same. A right triangle is characterized by having one angle that is exactly 90 degrees but may or may not have congruent sides.

Thus, the uniqueness of a scalene triangle, with its completely unequal sides and angles, perfectly fulfills the criteria set by the question.