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

 

nebulous

 adjective
adjective
BrE BrE//ˈnebjələs//
 
; NAmE NAmE//ˈnebjələs//
 
(formal)
 
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not clear synonym vague a nebulous concept Word Origin late Middle English (in the sense ‘cloudy’): from French nébuleux or Latin nebulosus, from nebula ‘mist’. The current sense dates from the early 19th cent.
See the Oxford Advanced American Dictionary entry: nebulous