JLPT N2
まだしも
would be acceptable; it'd be one thing if; rather; better ~
Structure / Usage
Noun + なら + まだしも; Verb + なら + まだしも
Example Sentences
一回ならまだしも、何度も同じミスをするのは問題だ。
Once would be one thing, but making the same mistake repeatedly is a problem.
子供ならまだしも、大人がそんなことをするなんて。
If it were a child it'd be one thing, but for an adult to do such a thing...