A person you think is crazy, strange, or dangerous in their thinking. It is a rude, informal word, used to push someone away: 'Don't listen to him, he's a wacko.' It is often used about people with extreme beliefs — 'some wacko sent the office a threatening letter', 'conspiracy wackos'. The word can also work as an adjective: 'a wacko idea', 'wacko theories'.

A person you think is crazy, strange, or dangerous in their thinking你覺得思想瘋狂、怪異、或很危險的人。It is a rude, informal word這是個不客氣的口語用字，used to push someone away用來把某人推開、排斥：'Don't listen to him, he's a wacko.'像'Don't listen to him, he's a wacko.'（別聽他的，他是個瘋子）。It is often used about people with extreme beliefs常常用在講有極端信念的人——'some wacko sent the office a threatening letter'像'some wacko sent the office a threatening letter'（某個瘋子寄了恐嚇信到辦公室）、'conspiracy wackos'或'conspiracy wackos'（陰謀論瘋子）。The word can also work as an adjective這個字也可以當形容詞用：'a wacko idea', 'wacko theories'像'a wacko idea'、'wacko theories'。

Note the difference from 'wacky', which comes from the same root but feels completely different. 'Wacky' is affectionate — a wacky friend is fun. 'Wacko' is not affectionate — a wacko friend is someone you are worried about, or someone you are insulting.

Note the difference from 'wacky'要注意它跟'wacky'不一樣，which comes from the same root but feels completely different雖然來自同一個字根，感覺卻完全不同。'Wacky' is affectionate'wacky'是帶著喜愛的——a wacky friend is funa wacky friend就是個好玩的朋友。'Wacko' is not affectionate'wacko'不是帶著喜愛的——a wacko friend is someone you are worried about, or someone you are insultinga wacko friend是你會擔心的人，或是你在羞辱的人。

Two more things. First, this is very much American English; British speakers know it but use 'nutter' or 'nutjob' more. Second, and more important: because it points at mental illness, careful speakers now avoid it.

Two more things還有兩件事。First, this is very much American English第一，這個字非常美式英文；British speakers know it but use 'nutter' or 'nutjob' more英國人聽得懂，但比較常用'nutter'或'nutjob'。Second, and more important第二，也更重要的是：because it points at mental illness因為它指向精神疾病，careful speakers now avoid it謹慎的說話者現在會避免用它。

In a newspaper, a school, or any polite setting, calling a real person a wacko sounds cruel and old-fashioned. Understand it when you hear it; think twice before saying it.

In a newspaper, a school, or any polite setting在報紙、學校，或任何有禮貌的場合，calling a real person a wacko sounds cruel and old-fashioned用wacko稱呼一個真實的人聽起來既殘忍又過時。Understand it when you hear it聽到的時候要聽得懂；think twice before saying it但自己要講之前先想清楚。