Harebrained and Potty

Harebrained adjective - Lacking in seriousness or maturity.

Potty and harebrained are semantically related In some cases you can use "Potty" instead an adjective "Harebrained".

Potty adjective - Being or characteristic of a person who has an offensive air of superiority and tends to ignore or disdain anyone regarded as inferior.

Harebrained and potty are semantically related in deranged topic. Sometimes you can use "Harebrained" instead an adjective "Potty", if it concerns topics such as insane.