Open English Wordnet
Nouns
(n)awkwardness, clumsiness, gracelessness, stiffnessthe inelegance of someone stiff and unrelaxed (as by embarrassment)
(n)severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness, stiffnessexcessive sternness“severity of character”, “the harshness of his punishment was inhuman”, “the rigors of boot camp”