Definitions

1. adjective

most extravagantly or absurdly unconventional or humorous; most wildly imaginative or fanciful

“The zaniest party of the summer was hosted by a group of friends in a mansion.”

2. noun

the quality or state of being zany; extravagantly or absurdly unconventional or humorous quality

“Her zaniest moment was when she decided to ride a unicycle on stage during the concert.”