The antonyms for the word "un extremer" are moderate, balanced, reasonable and temperate. These words signify the opposite of extremism, volatile or radical behavior. A moderate individual is characterized by a behavior that is not extreme in any way, maintaining a balance between the political, social and economic desires. A balanced individual is stable and composed, even in the most challenging situations. Reasonable individuals behave in a way that is ethical and understandable, adapting to the social norms and customs. Finally, a temperate individual is characterized by moderation and restraint in their behavior, avoiding impulsivity and rashness. All of these antonyms for "un extremer" increase social harmony and provide a peaceful and stable environment.