1.Definition: expressing extreme contempt

Related Adjective(s):contemptuous, insulting, scornful

2.Definition: 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"

Related Adjective(s):haughty, imperious, lordly, overbearing, prideful, sniffy, supercilious, swaggering