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はだめ

must not, is not allowed, won't do, is no good

→ 駄目だ
adjective Rare #39,519
must not, is not allowed Used after a verb’s te-form to say that an action is not allowed.
JA: ここで写真を撮ってはだめです。
EN: You must not take pictures here.
won't do, is no good Used after a noun or では to say that something is unsuitable or unacceptable.
JA: この答えではだめです。
EN: This answer won't do.
Forms of 駄目だ
ダメだめ駄目はだめ

あれではだめか？

Wouldn't that work?

— 惑星ソラリス (1972)

かよ加代は来てはだめです

Kayo isn’t allowed to come.

— The Wind Rises (2013)

このホテルではだめだ。

This hotel won't do.

しゃべってはだめ

Don't talk.

— 風の谷のナウシカ (1984)