arrogant
adj.adj. behaving as if you are much more important or clever than other people. You use this to describe someone who does not show respect because they think they are better than everyone else.
adj. characterised by an exaggerated sense of one's own importance or abilities. Often implies a lack of respect for others and a refusal to consider alternative viewpoints.
He is so arrogant that he never listens to my advice.
The manager's arrogant attitude made it very difficult for the team to suggest any new ideas during the meeting.
Success can sometimes breed an arrogant disregard for the very risks that a more humble professional would carefully evaluate before proceeding with a major investment.
From Middle English arrogaunt, from Old French arrogant, from Latin arrogāns, present active participle of arrogō.
Often used to modify people, their behavior, or their tone of voice; frequently follows linking verbs like 'be', 'seem', or 'become'.