Bumptious (adjective)

Overly confident or self-assertive; overly aggressive or arrogant.

Origin:

The word bumptious is a combination of the word bump, meaning to jut out or protrude, and the suffix -ious, meaning full of or characterized by. the word has been in use since the early 17th century.

Examples:

1. He was too bumptious for his own good.
2. The bumptious salesman made everyone uncomfortable.
3. She was so bumptious that she didn't realize she was annoying everyone.
4. He was bumptious and always wanted to be in charge.
5. The bumptious young man thought he knew everything.