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If someone is maniacal, they are behaving wildly, as if they have gone crazy — laughing too hard, wanting something in a burning way, working without rest. It is the adjective from maniac (a person who seems crazy). In real life it is rarely a doctor's word; it is the language of stories, films, and strong jokes. A “maniacal laugh” is the classic bad-guy laugh. You can also say someone is maniacal about a hobby, meaning they care in a slightly scary, all-in way. It is much stronger than “very keen,” and it can sound if you point it at a real .
瘋狂的；狂亂的（故事、電影口吻，不是診斷用語）
組成maniac + -al (makes an adjective). Maniac came through French maniaque and Late Latin maniacus from Greek maniakós, built on manía (madness).
同家族的字
- maniacthe person-word this adjective is built from
- maniathe older ‘madness / wild love of something’ piece
- maniacallythe adverb form
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
maniacaladj/məˈnaɪək(ə)l/
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Like a maniac; insane; frenzied.
- In other cases of moral alienation there will be found to have been more or less congenital moral defect, with maniacal exacerbations of positive moral insanity occurring perhaps at puberty, perhaps at the menstrual periods, perhaps after severe disappointment.
- He suddenly exploded into about three seconds of maniacal laughter and stopped again.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。