Bumptious and Cocksure

Bumptious adjective - Having a feeling of superiority that shows itself in an overbearing attitude.

Cocksure and bumptious are semantically related in offensively self-assertive topic. In some cases you can use "Cocksure" instead an adjective "Bumptious".

Cocksure adjective - Displaying or marked by rude boldness.

Bumptious and cocksure are semantically related in overconfident topic. You can use "Bumptious" instead an adjective "Cocksure".