fiend

1. N-COUNT If you describe someone as a fiend, you mean that they are extremely wicked or cruel. 恶魔[书面]

A tearful husband repeated calls for help in catching the fiend who battered his wife. 泪流满面的丈夫再三呼吁协助抓住殴打他妻子的那个恶棍。

2. N-COUNT Fiend can be used after a noun to refer to a person who is very interested in the thing mentioned, and enjoys having a lot of it or doing it often. 对...有嗜好的人; 着魔者[n N]

...if you're a heavy coffee drinker or a tea fiend. ...假如你喝很多咖啡或者嗜茶。