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1. Self-assertive or proud to an irritating degree
2. Offensively self-assertive
1. Tony Stark’s bumptious personality sometimes annoys his fellow Avengers, despite his genius.
2. The bumptious attitude of Lex Luthor makes him think he can outsmart Superman.
3. In the episode, Shinchan was being particularly bumptious, refusing to listen to his parents.
4. Batman dealt with the bumptious new villain in Gotham with his usual stoic efficiency.