Adjectives are words used to describe, show the characteristics of something.
You didn't show the excerpt that this question refers to, which makes it impossible for me to show you the adjective you need, but I'll show you how to find that adjective.
As stated above, an adjective is a word that shows the characteristics of something. Examples of adjectives are the words: ugly, beautiful, noisy, apprehensive, nervous, small, happy, indifferent, excited, silent, among others.
In this case, to answer your question you must:
Read the entire text.
Identify the way people, described in the text, behave.
Find the word that best represents this type of behavior.
In this case, we can conclude that the function of the adjective is to describe, and by trying to describe the behavior of the population, you will be able to find the adjective you need.
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