WordNet sense 1 (stubbornly obstructive and unwilling to cooperate):

bloody-minded

WordNet sense 2 (tenaciously unwilling or marked by tenacious unwillingness to yield):

obstinate, unregenerate

WordNet sense 3 (having a difficult and contrary disposition):

crotchety, ornery

WordNet sense 4 (having an irritable and unpleasant disposition):

ill-natured