
umfangreich
extensive
Large in terms of scope, content, or extent; very comprehensive or detailed.
Die Polizei hat umfangreiche Ermittlungen in dem Fall eingeleitet.
The police have launched extensive investigations into the case.
extensive / corpulent
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extensive
Large in terms of scope, content, or extent; very comprehensive or detailed.
Die Polizei hat umfangreiche Ermittlungen in dem Fall eingeleitet.
The police have launched extensive investigations into the case.

corpulent
Having a large body circumference; corpulent or stout. This meaning is rarer and often slightly elevated or outdated.
Der umfangreiche Herr trug einen eleganten, aber zu engen Anzug.
The corpulent gentleman wore an elegant but too-tight suit.
The word is made up of 'Umfang' (scope, circumference) and 'reich' (rich). So it literally means 'rich in scope/circumference,' which can refer both to abstract things and to body circumference.
Für das Projekt ist eine umfangreiche Recherche notwendig.
Extensive research is necessary for the project.
This adjective often describes abstract nouns. Common combinations are: umfangreiches Wissen (extensive knowledge), eine umfangreiche Sammlung (an extensive collection), ein umfangreiches Angebot (an extensive range), or eine umfangreiche Analyse (an extensive analysis).
Das Museum besitzt eine umfangreiche Sammlung moderner Kunst.
The museum has an extensive collection of modern art.
The meaning 'corpulent' is rare and somewhat outdated. You can recognize it when the adjective refers directly to a person's build. In almost all other cases, the meaning 'extensive' or 'detailed' is intended.
Der Roman beschreibt einen älteren, umfangreichen Herrn mit Schnurrbart.
The novel describes an older, corpulent gentleman with a mustache.
massive / solid
Both words can describe a large scale or quantity. „Umfangreich“ mainly emphasizes that something includes many parts or extends a long way, while „massiv“ focuses more on severity and force. Use „umfangreich“ for scope and „massiv“ for intensity.

Die Stadt musste wegen des Unwetters umfangreiche Reparaturen planen.
The city had to plan extensive repairs because of the storm.
Die Stadt musste wegen des Unwetters massive Schäden melden.
The city had to report massive damage because of the storm.