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

 

gainful

 adjective
adjective
BrE BrE//ˈɡeɪnfl//
 
; NAmE NAmE//ˈɡeɪnfl//
 
(formal)
 
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used to describe useful work that you are paid for gainful employment
See the Oxford Advanced American Dictionary entry: gainful