A central vowel refers to a vowel where the position of the tongue is in the middle.

He often behaves in a foolish manner.

I was surprised by his stupidity.

The aardvark is a rare animal that lives in Africa.

This project is still in its infancy.

He has experienced a life of hardship and wandering.

He returned from a long journey and was exhausted and wandering aimlessly.

He was standing at the top of the mountain.

Kawachi is my best friend.

His actions led to the problem.