insane in a sentence

Definition

Insane: extremely exciting, thrilling, or irrational; wildly excessive or unreasonable.

The roller coaster was so steep and fast that it felt absolutely insane.
After running a marathon without any training, he realized how insane that decision had been.
Her artwork was so vivid and imaginative that many critics deemed it insane genius.
The concept of traveling to another galaxy in our lifetime seems insane but possible.
He had an insane amount of energy, making it hard for anyone to keep up with him.