intriguer
🇬🇧/ˈɪntriːɡə(r)/ 🇺🇸/ɪnˈtrɪɡər/a person who devises plots or intrigues; "he is believed to be the principal designer of the terrorist bombing attack"
noun [专属名词] [法] 密谋者,阴谋者;私通者
The court was full of intriguers plotting against the king. 宫廷里到处都是密谋反对国王的阴谋家。