Behavior that shows a lack of good sense or judgement.
Often when I tell people about my outdoor runs, this time of year, I'm met with a look of bewilderment. That's followed by the question, "why?!" The exclamation point was necessary because it's often more of a demand of an explanation than a simple inquiry. Many don't understand why I would willingly go out in freezing temps and run. And they REALLY don't understand why I seem to enjoy it.