不白之冤

unrighted wrong / unredressed injustice

no; not so / (bound form) not; un-

white / snowy / pure / bright / empty / blank / plain / clear / to make clear / in vain / gratuitous / free of charge / reactionary / anti-communist / funeral / to stare coldly / to write wrong character / to state / to explain / vernacular / spoken lines in opera

(possessive particle, literary equivalent of 的[de5]) / him / her / it

injustice / grievance / wrong

old variant of 冤[yuan1]