
ausführlich
detailed
With many details and very comprehensive; detailed and precise.
Der Zeuge hat den Vorfall sehr ausführlich geschildert.
The witness described the incident in great detail.
detailed
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detailed
With many details and very comprehensive; detailed and precise.
Der Zeuge hat den Vorfall sehr ausführlich geschildert.
The witness described the incident in great detail.
The word is derived from the verb 'ausführen' (to carry out / to explain in detail). When you 'ausführt' something, you present it in detail. 'Ausführlich' (detailed) therefore describes a result that is very detailed.
Bitte schreiben Sie eine ausführliche Zusammenfassung des Buches.
Please write a detailed summary of the book.
'Ausführlich' (in detail) can also be used as an adverb. It then describes how an action is carried out and usually stands directly with the verb.
Wir haben das Thema im Team ausführlich diskutiert.
We discussed the topic in detail as a team.
Common nouns combined with 'ausführlich' (detailed) are things that contain information: ein ausführlicher Bericht (a detailed report), eine ausführliche Erklärung (a detailed explanation), ein ausführliches Gespräch (a detailed conversation), or eine ausführliche Anleitung (detailed instructions).
In der E-Mail fand ich eine ausführliche Beschreibung des Problems.
In the email, I found a detailed description of the problem.
extensive / corpulent
In the case of a report, both words can indicate a large amount of content. „Ausführlich“ mainly emphasizes that something is explained with many details, while „umfangreich“ highlights the report's large overall scope, for example because it contains many pages or covers many topics. Use „ausführlich“ for the level of detail and „umfangreich“ for the report's size.

Der Bericht erklärt die Ursachen des Problems ausführlich und nennt viele Einzelheiten.
The report explains the causes of the problem in detail and lists many specifics.
Der Bericht ist umfangreich und umfasst mehr als hundert Seiten.
The report is extensive and runs to more than one hundred pages.