fateful
adjective /ˈfeɪtfl/
  /ˈfeɪtfl/
[usually before noun]- 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
 
Oxford Collocations DictionaryFateful is used with these nouns:- day
 - decision
 - encounter
 - …