Definitions

1. noun

a person who is considered to be eccentric or unstable

“He’s been called a nutcase by his family due to his unusual behavior.”

2. noun

a person who is considered to be crazy or foolish

“Some people think the artist is a bit of a nutcase, but his work is genius.”

3. verb

to drive someone mad or to cause them to go crazy

“The stress of the job has been driving her to nutcase.”