Nonsensical

a quote from Royal Robbins' Fail Falling:

I did a lot of reading at this time, including Herman Melville's Moby Dick. Why did I like Melville's famous novel so much? Because it was outdoors and elemental, and the main character, Captain Ahab, was on a quest to slay the white whale. That quest, like climbing, was nonsensical to most people, but it resonated perfectly with me.