n. 25B6; noun
out of sheer perversity, he refused : CONTRARINESS, awkwardness, recalcitrance, stubbornness, obstinacy, obduracy, mulishness, pig-headedness; informal cussedness; Brit. informal bloody-mindedness; formal refractoriness.
the perversity of the decision : UNREASONABLENESS, irrationality, illogicality, wrong-headedness.