“无从区分是非的”可以翻译为“indistinguishable in terms of right and wrong” 或者 “incapable of being differentiated as right or wrong” 。
例如：
This situation is indistinguishable in terms of right and wrong, making it hard to make a judgement.（这种情况无从区分是非，很难做出判断 。）
The arguments presented are so convoluted that they are incapable of being differentiated as right or wrong.（所提出的论点如此复杂，以至于无从区分是非 。）