The term "unextreme" implies a middle ground or a state of normalcy. Therefore, antonyms for this word would be words that suggest extremes, such as "radical," "extreme," "intense," "drastic," "severe," and "profound." Other antonyms include "abnormal," "outrageous," "unconventional," "eccentric," and "unusual." These words signify a departure from the norm or a break from the usual patterns, making them antonyms to "unextreme." People who use these words in their speech, writing, or thinking are likely to embrace change and seek novel experiences. The opposite would be those who prefer a stable and predictable lifestyle that follows a systematic routine.