(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’.