Quick Scoop
If you want the closest common way to say “shut up” in Japanese, 黙れ (_damare_) is the blunt, rude version, while うるさい (_urusai_) is more like “you’re noisy / be quiet” and is less harsh. For a safer, polite option, use 静かにしてください (_shizuka ni shite kudasai_), which means “please be quiet.”
Japanese Romaji Tone Meaning
黙れ damare Very rude Shut up
うるさい urusai Rude / casual You’re noisy / be quiet
静かにしてください shizuka ni shite kudasai Polite Please be quiet
Use the polite version in real life unless you’re intentionally being confrontational. Sources describe _damare_ as the most direct and aggressive option, and _shizuka ni shite kudasai_ as the safest polite phrase.