傻了

stupid

→ 傻
phrase Uncommon #5,395
stupid 了 can suggest that someone has become or is acting stupid. The phrase can sound insulting, depending on context.
CH: 你怎么傻了?
EN: Why are you acting so stupid?

不要傻了,

Don't be silly.

— 回归 (2003)

想傻了

You must be dreaming.

— 双重赔偿 (1944)

你是不是吸毒吸傻了?

Did drugs fry your brain?

你傻了?

Are you stupid?

— 赫鲁斯塔廖夫,开车! (1999)

别抽了你,你都快抽傻了!!

Stop smoking—you’re practically smoking yourself stupid!!

— 怒火青春 (1995)

爱娃,你必须离开元首不要傻了

Eva, you must leave the Führer. Don’t be foolish.

— 帝国的毁灭 (2004)

是我傻了

I'm such an idiot.

— 妈咪 (2014)

别看傻了,

Stop staring blankly.

— 精英部队2:大敌当前 (2010)

你傻了吗

Are you stupid?

— 小萝莉的猴神大叔 (2015)

你傻了吗?

Are you stupid?

— 阿黛尔的生活 (2013)

你让大家都看傻了

You left everyone speechless.

— 控制 (2007)

不要傻了

Don't be silly.

— 帝国的毁灭 (2004)

你傻了?

Are you stupid?

— 叶问 (2008)

因为他们都傻了吗?

Is it because they're all stupid?

— 维多利亚 (2015)

傻了你?

Are you stupid?

— 喜剧之王 (1999)