having or showing arrogant superiority to and disdain of those one views as unworthy; "some economists are disdainful of their colleagues in other social disciplines"; "haughty aristocrats"; "his lordly manners were offensive"; "walked with a prideful swagger"; "very sniffy about breaches of etiquette"; "his mother eyed my clothes with a supercilious air"; "shaggy supercilious camels"; "a more swaggering mood than usual"- W L Shirer
To be disdainful means to dislike something or someone because you think they are unimportant or not worth your attention. He is highly disdainful of anything to do with the literary establishment = scornful, contemptuous + disdainfully dis·dain·ful·ly `We know all about you,' she said disdainfully. showing that you do not respect someone or something, because you think that they are not important or good enough
Showing contempt or scorn. Having a pronounced lack of concern for others viewed as unworthy