Definition of hindsight noun from the Oxford Advanced Learner's Dictionary

 

hindsight

 noun
noun
BrE BrE//ˈhaɪndsaɪt//
 
; NAmE NAmE//ˈhaɪndsaɪt//
 
[uncountable]
 
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the understanding that you have of a situation only after it has happened and that means you would have done things in a different way With hindsight it is easy to say they should not have released him. What looks obvious in hindsight was not at all obvious at the time. It's easy to criticize with the benefit of hindsight. compare foresightExtra examples It is easy to criticize others when you have the benefit of hindsight. Their first idea was deemed, in hindsight, a mistake. This all seems obvious with hindsight.
See the Oxford Advanced American Dictionary entry: hindsight