- reckless; rash; irresponsible: He had a harum-scarum youth.
- disorganized; uncontrolled.
- recklessly; wildly: He ran harum-scarum all over the place.
- a reckless person.
- reckless or unpredictable behavior or action.
- in a reckless way or of a reckless nature
- a person who is impetuous or rash
