Definition of trivial adjective from the Oxford Advanced American Dictionary

 

trivial

 adjective
adjective
NAmE//ˈtrɪviəl//
 
 
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not important or serious; not worth considering a trivial detail I know it sounds trivial, but I'm worried about it. I'll try to fix it—but it's not trivial (= it may be difficult to fix).
 
adverb
See the Oxford Advanced Learner's Dictionary entry: trivial