
rückblickend
in retrospect
Looking back on a past period or event and evaluating it from today's perspective.
Rückblickend war es die beste Entscheidung meines Lebens.
In retrospect, it was the best decision of my life.
retrospective
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in retrospect
Looking back on a past period or event and evaluating it from today's perspective.
Rückblickend war es die beste Entscheidung meines Lebens.
In retrospect, it was the best decision of my life.
'Rückblickend' (looking back/in retrospect) is the present participle of the separable verb 'zurückblicken' (to look back). It literally means 'looking backward' and is used to talk about the past.
Der Sportler blickte auf eine erfolgreiche Karriere zurück.
The athlete looked back on a successful career.
Very often, 'rückblickend' (in retrospect) stands at the beginning of the sentence in position 1. In this case, the conjugated verb follows directly in position 2, before the subject.
Rückblickend hätte ich mich anders entscheiden sollen.
In retrospect, I should have made a different decision.
The word is almost always used to evaluate a past situation from today's perspective. A very common fixed phrase is 'rückblickend betrachtet' (considered in retrospect).
Rückblickend betrachtet war der Umzug die richtige Entscheidung für unsere Familie.
Considered in retrospect, the move was the right decision for our family.
belated / subsequent
Nachträglich describes an action that takes place only after an event has already ended. Rückblickend applies when someone looks back on or evaluates the past event from today’s perspective. The key difference is whether someone acts later or looks back later.

Rückblickend beurteilt Paul seine Worte im damaligen Streit als unfair.
In retrospect, Paul considers the words he used in that argument unfair.
Nach dem Streit entschuldigte sich Paul nachträglich für seine Worte.
After the argument, Paul apologized belatedly for his words.