Birdbrained and Yo-yo

Birdbrained adjective - Lacking in seriousness or maturity.

Yo-yo and birdbrained are semantically related in limited topic. In some cases you can use "Yo-yo" instead an adjective "Birdbrained".

Yo-yo noun - A person who lacks good sense or judgment.

Birdbrained and yo-yo are semantically related in limited topic. Sometimes you can use "Birdbrained" instead an adjective phrase "Yo-yo".