The highest order of derivative (the differentiability class) over a given domain.
The condition of being smooth; the degree or measure of said condition.
The quantity measured by the modulus of smoothness.
The condition of being ugly.
An unsightly or frightful object.
Unpleasant behaviour.
Everything that's realistic has some sort of ugliness in it. Even a flower is ugly when it wilts, a bird when it seeks its prey, the ocean when it becomes violent. Sharon Tate