Definition of ulterior adjective from the Oxford Advanced Learner's Dictionary

 

ulterior

 adjective
adjective
BrE BrE//ʌlˈtɪəriə(r)//
 
; NAmE NAmE//ʌlˈtɪriər//
 
[only before noun]
 
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(of a reason for doing something) that somebody keeps hidden and does not admit She must have some ulterior motive for being nice to me—what does she really want? More Like This Adjectives that only come before a noun all-round, antenatal, aspiring, chief, dedicated, eventual, express, high-flying, live, lone, mere, mitigating, rogue, sheer, standout, ulterior, utterSee worksheet. Word Origin mid 17th cent.: from Latin, literally ‘further, more distant’.
See the Oxford Advanced American Dictionary entry: ulterior