looney

The looney next door waves at his mailbox every morning.

用法提示：looney 是名词，在句中作主语，指行为疯癫的人。

People called him a looney because he talked to himself in the street.

用法提示：looney 是名词，在句中作宾语补足语，指被人看成的疯子。

My neighbor is a looney, but he is harmless.

用法提示：looney 是名词，在句中作表语，描述邻居是疯癫的人。