Meaning of harum-scarum

(adj) cheerfully irresponsible; "carefree with his money"; "freewheeling urban youths"; "had a harum-scarum youth"

(adv) in a wild or reckless manner; "dashing harum-scarum all over the place"; "running pell-mell up the stairs"

(noun) a reckless impetuous irresponsible person