みなければ

unless (one) tries doing, if (one) doesn't try doing

→ 見る
auxiliary Rare #36,843
unless (one) tries doing, if (one) doesn't try doing Used after the て-form of a verb as the negative conditional of てみる, meaning to try doing something. Often appears in expressions meaning that something cannot be known or done unless it is tried.
JA: 食べてみなければ、味はわからない。
EN: Unless you try it, you won't know how it tastes.
Conjugation of 見る
Conditional
みたらみればみなければ

試してみなければ決して分からないだろう。

You’ll never know unless you try.

靴を買う前には、試しに履いてみなければならない。

Before buying shoes, you have to try them on.

私たちはその計画を良く考えてみなければならない。

We need to think the plan through carefully.

やってみなければ自分の力はわからない。

You won't know what you're capable of until you try.

捜査が終わってみなければ事実は分からないだろう

We won't know the truth until the investigation is complete.

— Article 15 (2019)