mis ‧ deed /ˌmɪsˈdiːd/ BrE AmE noun [countable]
[ Word Family: verb : ↑ do , ↑ outdo , ↑ overdo , ↑ redo , ↑ undo ; noun : ↑ deed ≠ ↑ misdeed , ↑ do , ↑ doing ; adjective : ↑ done , ↑ overdone , ↑ undone ]
formal a wrong or illegal action:
He now repents of his past misdeeds.