Brainless means completely stupid: acting as if you have no brain at all — not a small slip, but something a person would not do if they had used their head. Informal, and unkind if you say it about a person.

BrainlessBrainless means completely stupid意思是完全笨：acting as if you have no brain at all表現得好像完全沒有大腦一樣——not a small slip不是小小的失誤，but而是 something a person would not do if they had used their head一件如果有用腦子就不會做的事。Informal這是口語用字，and而且 unkind if you say it about a person如果拿來說一個人是不客氣的。

We also use it of actions, ideas, and rules: a brainless mistake, a brainless rule. It is stronger than silly and close to stupid.

We also use it我們也會拿它 of actions, ideas, and rules來說行為、想法和規定：a brainless mistake無腦的錯誤、a brainless rule無腦的規定。It is stronger than silly它比 silly（傻）語氣更重，and而且 close to stupid接近 stupid（笨）。

A kind teacher almost never calls a student brainless. Younger speakers, especially online, use it the way Taiwanese speakers use 無腦.

A kind teacher一位好心的老師 almost never calls a student brainless幾乎不會用 brainless 稱呼學生。Younger speakers年輕的說話者，especially online尤其在網路上，use it the way Taiwanese speakers use 無腦用法就像台灣人說「無腦」一樣。

Though actually, we often put it on a moment (“that was brainless”) rather than on a whole human being, and that is a little kinder. The word is almost always figurative; it does not mean a body with the brain taken out.

Though actually不過其實，we often put it on a moment我們常常是用在某個瞬間上（'that was brainless''that was brainless'），rather than on a whole human being而不是整個人身上，and而且 that is a little kinder這樣說比較沒那麼傷人。The word is almost always figurative這個字幾乎都是比喻用法；it does not mean a body with the brain taken out並不是指一個大腦被拿掉的身體。