IPA: /ˈbʌmpʃəs/
KK: /ˈbʌmpʃəs/
Someone who is overly confident and tries to impress others in a loud or annoying way.
His bumptious attitude made it hard for others to work with him.
Bumptious → It is formed from 'bumpt' (a dialectal variant of 'bump', meaning to thump or strike) and the suffix '-ious' (meaning full of or characterized by). The word 'bumptious' describes someone who is full of themselves or overly self-assertive, as if they are striking or bumping into others with their attitude.
Think of someone who is 'bumping' into others with their loud and self-assertive behavior — that's why 'bumptious' means overly self-assertive.