A/An __________ triangle has no two sides or angles equal and no right angle.

A triangle with no two sides or angles equal and no right angle is classified as a scalene triangle. In geometry, a scalene triangle is characterized by having all sides of different lengths and all angles of different measures. Since it has no equal sides or angles, it inherently cannot have a right angle.

An equilateral triangle, on the other hand, has all sides and angles equal, and thus cannot meet the criteria set in the question. An isosceles triangle features at least two equal sides and angles, which again does not fulfill the requirement of having no equal sides. A right triangle specifically includes a right angle, which contradicts the condition of not having a right angle. Therefore, the characteristics of scalability define the proper classification for the given criteria.