ulterior
Word family adjectiveulterioradverbulteriorly
ul·te·ri·or /ʌlˈtɪəriə $ -ˈtɪriər/ adjectiveadj ulterior motive/purpose etc REASONa reason for doing something that you deliberately hide in order to get an advantage for yourself 别有用心的动机/目的等 He’s just being nice. I don’t think he has any ulterior motives. 他就是好心,我不认为他别有用心。
Origin ulterior (1600-1700) Latin “farther”, from ulter “in a position beyond”, from uls “beyond”