ar·ro·gant 
(ărə-gənt)
(ărə-gənt)adj.
1. Having or displaying a sense of overbearing self-worth or self-importance.
2. Marked by or arising from a feeling or assumption of one's superiority toward others: an arrogant contempt for the weak.
[Middle English arrogaunt, from Old French, from Latin arrogāns, arrogant-, present participle of arrogāre, to arrogate; see ARROGATE.]
arro·gant·ly adv.
Synonyms: arrogant, haughty, disdainful, supercilious
These adjectives mean characterized by an inflated ego and disdain for what one considers inferior. One who is arrogant is overbearingly proud and demands excessive power or consideration: an arrogant and pompous professor, unpopular with students and colleagues alike. Haughty suggests superiority, as by reason of high status: "Her laugh was satirical, and so was the habitual expression of her arched and haughty lip" (Charlotte Brontë).
Disdainful emphasizes scorn or contempt: "Nor [let] grandeur hear with a disdainful smile, / The short and simple annals of the poor" (Thomas Gray).
Supercilious implies haughty disdain and aloofness: "Failure would confirm the critics who called him supercilious for following his own methods and not theirs" (Neal Bascomb).
These adjectives mean characterized by an inflated ego and disdain for what one considers inferior. One who is arrogant is overbearingly proud and demands excessive power or consideration: an arrogant and pompous professor, unpopular with students and colleagues alike. Haughty suggests superiority, as by reason of high status: "Her laugh was satirical, and so was the habitual expression of her arched and haughty lip" (Charlotte Brontë).
Disdainful emphasizes scorn or contempt: "Nor [let] grandeur hear with a disdainful smile, / The short and simple annals of the poor" (Thomas Gray).
Supercilious implies haughty disdain and aloofness: "Failure would confirm the critics who called him supercilious for following his own methods and not theirs" (Neal Bascomb).