
zahlreich
numerous
Present in large numbers; many.
Zahlreiche Besucher kamen zur Eröffnung des Museums.
Numerous visitors came to the opening of the museum.
numerous
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numerous
Present in large numbers; many.
Zahlreiche Besucher kamen zur Eröffnung des Museums.
Numerous visitors came to the opening of the museum.
The word is made up of 'Zahl' (number) and 'reich' (rich). So it literally means 'rich in number' and describes a large quantity.
Das Land ist reich an Bodenschätzen.
The country is rich in natural resources.
'Zahlreich' (numerous) can stand not only before a noun but can also be used as an adverb. It then means 'in large numbers' and often appears at the end of the sentence.
Die Fans erschienen zahlreich zum Konzert.
The fans showed up in large numbers for the concert.
'Zahlreich' (numerous) is used more often in written language or in more formal contexts. It often sounds somewhat elevated.
Zahlreiche Studien belegen die Wirksamkeit dieser Methode.
Numerous studies demonstrate the effectiveness of this method.
much / a lot
Viel and zahlreich can describe a large number of people or things. Viel is the neutral statement of quantity, while zahlreich, as an inflected adjective, usually sounds more formal and emphasizes the large number more strongly. Viele is common in everyday language, while zahlreiche is often more suitable in formal texts.

Zahlreiche Besucher kamen am Samstag zur Ausstellung.
Numerous visitors came to the exhibition on Saturday.
Viele Besucher kamen am Samstag zur Ausstellung.
Many visitors came to the exhibition on Saturday.