(of a reason for doing something )行事的理由 that somebody keeps hidden and does not admit 隐秘的;不可告人的;秘密的;矢口否认的 She must have some ulterior motive for being nice to me—what does she really want? 她对我这么好,一定别有用心。她到底想干什么呢?
Oxford Collocations DictionaryUlterior is used with these nouns:- motive
More Like This Adjectives that only come before a nounAdjectives that only come before a nounWord Originmid 17th cent.: from Latin, literally ‘further, more distant’.