The term "most powerhouse" denotes a level of greatness, strength or dominance. Its antonyms can range from mild to extreme in nature. Some of the milder antonyms could include weak, mediocre, or insignificant. The opposite of powerhouse could also include words like vulnerable or fragile, indicating a lack of stability or strength. At the other end of the spectrum, extreme antonyms for most powerhouse could include terms such as incompetent or ineffectual, suggesting an utter lack of power or ability. Conversely, balanced, moderate, or ordinary could also serve as antonyms for the word, signaling a lack of excess or substantial power.