This is the 15677th most frequent German word.
ziemliche
"Ziemliche" means "quite" or "considerable" in English, depending on context.
Here, 'ziemliche' is used to convey a notable extent or degree of the worries in the context of concern.
Du machst mir ziemliche Sorgen.
You are causing me quite some worries.
Here, 'ziemliche' is used to denote a significant or substantial degree of the noun 'Herausforderung', meaning challenge.
Das ist eine ziemliche Herausforderung.
That is quite a challenge.
In this sentence, 'ziemliche' modifies 'viele Leute' to emphasize the considerable quantity of people present.