What term describes a quality of being not extreme?

The term that describes a quality of being not extreme is "temperate." This word is often associated with moderation and balance, indicating something that avoids excess or extremes. For example, a temperate climate has mild temperatures, neither too hot nor too cold. The use of the word reinforces the idea of moderation across various contexts, whether it's in behavior, lifestyle, or environmental conditions.

In this question, the other options, while valid words, do not convey the same meaning of moderation or lack of extremity. "Admonish" refers to scolding or warning someone, "tangential" relates to something that is only slightly relevant or peripheral to the main topic, and "apprise" means to inform or make aware. None of these capture the essence of moderation or the absence of extremity like "temperate" does.