Describing character & temperament
/ˈær.ə.ɡənt/
Having an exaggerated sense of one's own importance or ability.
Stronger and colder than 'proud'. Pride can be earned and quiet; arrogance is always directed outward — it needs someone to look down on.
Haughty, Imperious, Supercilious, Conceited, Insolent
Humble, Modest, Meek, Unassuming
His arrogant dismissal of the junior engineers' warnings delayed the project by months.