post factum
/ˌpəʊs(t)ˈfaktəm/adverb
After the event; with hindsight.
adjective
Occurring, existing, etc., after the event; done with hindsight.
Origin
Mid 17th century. From classical Latin post factum after the fact from post after + factum. With use as adjective compare earlier post-fact, post facto. With use as adverb compare slightly later post facto.