Adjective (な)
Noun
Usually written in kana
1. no good; not serving its purpose; useless; broken
鏡をダメにした。I ruined the mirror.
2. hopeless; wasted; in vain; purposeless
3. cannot; must not; not allowed
あなたも無理しちゃダメよ。You mustn't push yourself too hard either.
4. neutral point; intersection owned by neither player at the end of a game
5. no!; stop!