Insane
Jake: Did you hear about Sam’s new job?
Lena: No, what happened?
Jake: He’s moving to a tiny island to work as a diving instructor.
Lena: That’s insane! He doesn’t even like the ocean!
very stupid, crazy or dangerous; shocking or very impressive
Sam is moving to a tiny island — a small island in the ocean. He wants to work as a diving instructor — he wants to teach and train people how to go deep under the water. That’s a diving instructor’s job. Lena says it’s an insane idea (a crazy idea) because Sam doesn’t like the ocean.