
wahrhaftig
true
Expresses that something is genuine, authentic, and not merely seemingly so. It describes a deep inner truth or quality.
Er ist ein wahrhaftiger Künstler, der für seine Arbeit lebt.
He is a true artist who lives for his work.
true / truly
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true
Expresses that something is genuine, authentic, and not merely seemingly so. It describes a deep inner truth or quality.
Er ist ein wahrhaftiger Künstler, der für seine Arbeit lebt.
He is a true artist who lives for his work.

truly
Used as an adverb to reinforce a statement and express amazement or strong conviction; it means something like 'indeed' or 'really'.
Das ist wahrhaftig die beste Pizza, die ich je gegessen habe!
That is truly the best pizza I have ever eaten!
'Wahrhaftig' (true/truly) belongs to the word family of 'wahr' (true) and 'Wahrheit' (truth). It intensifies the idea of genuineness and authenticity and means more than just 'wahr' (true).
Seine Geschichte klang nicht nur wahr, sondern wahrhaftig.
His story sounded not only true, but genuine.
The function of the word depends on its position. As an adjective, it stands before a noun ('ein wahrhaftiger Freund' — a true friend). As an adverb for emphasis, it often stands at the beginning of the sentence or before another adjective ('Das ist wahrhaftig schön!' — That is truly beautiful!).
Sie ist eine wahrhaftige Expertin auf ihrem Gebiet.
She is a true expert in her field.
'Wahrhaftig' (true/truly) belongs to elevated or slightly old-fashioned language. It is rarely used in everyday colloquial speech; people would more likely say 'wirklich' (really) or 'echt' (real/really).
Das Schloss war ein wahrhaftig königlicher Anblick.
The castle was a truly royal sight.
When 'wahrhaftig' (truly) stands at the beginning of a sentence as an adverb for reinforcement (position 1), the conjugated verb follows directly after it (inversion).
Wahrhaftig, das hätte ich nicht von ihm erwartet!
Truly, I would not have expected that from him!
really
wirklich neutrally confirms that a statement is actually true. wahrhaftig reinforces the same statement more strongly and can also express amazement. wirklich is appropriate for a factual confirmation; when the speaker is clearly surprised or especially convinced at the same time, wahrhaftig is a better fit.

Er hat wahrhaftig alle Aufgaben an einem Tag erledigt!
He truly completed all the tasks in one day!
Er hat wirklich alle Aufgaben an einem Tag erledigt.
He really completed all the tasks in one day.