Bonkers (adjective)

Crazy, insane or senseless.

Origin:

The origin of the word bonkers is uncertain, but it is thought to have originated in the early 20th century as a slang term that means crazy, insane or senseless.

Examples:

1. You must be bonkers to think that's a good idea.
2. He went bonkers when he saw the spider.
3. She"s bonkers if she thinks I"m going to do that.
4. He's completely bonkers.
5. The plan is completely bonkers.