too big for one's britches

arrogant bombastic cocky exultant pompous pretentious

big big-headed conceited crowing egotistic egotistical full of hot air highfalutin hot stuff know-it-all loudmouth on ego trip puffed-up self-aggrandizing self-applauding smart-alecky snooty strutting stuck-up swaggering swanky swollen-headed vainglorious vaunting windbag

humble modest unconceited

deprecating

arrogant big-headed cocky conceited condescending egotistic haughty high-and-mighty hoity-toity nose in the air ostentatious patronizing pompous pretentious puffed up snippy snooty snotty uppity vain