Here's what rhymes with unpunished.

Consider these alternatives

unheeded / conceded unreported / imported unrewarded / rewarded unchecked / effect undetected / rejected unaddressed / best berserk / work awry / by unappreciated / dated unrecorded / accorded unrepaired / help astray / they perpetrated / dated uncorrected / rejected unmolested / requested atrocious / diagnosis crimes / times gone / long deed / need unsaid / said unabated / dated unscathed / based unnoted / noted savagery / very condone / known betweens / means