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

 

fateful

 adjective
adjective
BrE BrE//ˈfeɪtfl//
 
; NAmE NAmE//ˈfeɪtfl//
 
[usually before noun]
 
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having an important, often very bad, effect on future events She looked back now to that fateful day in December. his final fateful journey to Moscow
See the Oxford Advanced American Dictionary entry: fateful