Definition of ulterior adjective from the Oxford Advanced American Dictionary

 

ulterior

 adjective
adjective
NAmE//ʌlˈtɪriər//
 
[only before noun]
 
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(of a reason for doing something) that someone keeps hidden and does not admit She must have some ulterior motive for being nice to me—what does she really want?
See the Oxford Advanced Learner's Dictionary entry: ulterior