Definitions

1. adjective

extremely foolish or silly

“The looney idea for a new business venture was quickly dismissed.”

2. noun

a member of the Looney Tunes cartoon characters

“The child was thrilled to see Bugs Bunny, a famous Looney character.”

3. noun

a person who is eccentric or unconventional

“The artist was known as a looney for her unorthodox approach to painting.”