Practise the thinking. Keep the judgement.
駄目 (dame): Not allowed; no good; unsuitable
だめ
dame
Meaning
Not allowed; no good; unsuitable
Two original examples
ここで写真を撮ってはだめです。
You must not take photographs here.
このペンはもうだめです。
This pen no longer works.
Usage and distinctions
だめ changes its English translation with context: a prohibition, something that will not work, or an unfavourable result. It is not a neutral substitute for every English “no”. In 〜てはだめ, it prohibits an action.