mulishness
n 1: the trait of being difficult to handle or overcome [syn:
{stubbornness}, {obstinacy}, {obstinance}, {mulishness}]
Mulish \Mul"ish\ (m[=u]l"[i^]sh), a.
Like a mule; sullen; stubborn. -- {Mul"ish*ly}, adv. --
{Mul"ish*ness}, n.
[1913 Webster]