fiend
noun /fiːnd/
  /fiːnd/
- a very cruel or unpleasant person恶魔般的人;残忍的人;令人憎恶的人 
- (informal) (used after another noun用于另一名词后 …迷;…狂;爱好者 - a crossword fiend纵横填字游戏爱好者 
 
- a crossword fiend
- an evil spirit魔鬼;恶魔 
词源Old English fēond ‘an enemy, the devil, a demon’, of Germanic origin; related to Dutch vijand and German Feind ‘enemy’.