wrong ‧ ful /ˈrɒŋf ə l $ ˈrɒːŋ-/ BrE AmE adjective
[ Word Family: adverb : ↑ wrong , ↑ wrongly , ↑ wrongfully ; adjective : ↑ wrong , ↑ wrongful ; verb : ↑ wrong ; noun : ↑ wrong ]
wrongful arrest/conviction/imprisonment/dismissal etc a wrongful arrest etc is unfair or illegal because the person affected by it has done nothing wrong:
She’s threatening to sue her employers for wrongful dismissal.
—wrongfully adverb