expression
unavoidable; inevitable; there's no help for it
A set phrase meaning that a situation cannot be helped or avoided; often used when resigning oneself to an outcome. Slightly formal or literary.
こうなった以上、是非もない。
Now that it has come to this, there's no help for it.
結果は是非もないことだ。
The result is unavoidable.
From 是非 (right and wrong, pros and cons) + も (inclusive particle) + ない (not exist). Literally 'there is no right or wrong', implying that the situation is beyond judgment and thus unavoidable.