The opposite of "more tempered" can be expressed in various ways depending on the context, but some possible antonyms include uncontrolled, unbridled, unrestrained, hysterical, wild, uncontrollable, rash, impulsive, passionate, and fiery. These words convey a lack of restraint or moderation, which can lead to excess, impulsivity, or recklessness. In contrast, "more tempered" implies a degree of self-control, reason, or moderation that allows one to assess situations, make sound decisions, and act in a measured manner. Antonyms for "more tempered" can be useful in describing behaviors, emotions, or attitudes that are opposite to those associated with temperance or restraint.