Instead of "more strengthened," one can use the antonyms "weakened" or "diminished." These words suggest a reduction in strength or effectiveness, rather than an increase. Other antonyms for "more strengthened" include "weaker," "less fortified," and "less secure." These opposing terms can be useful in situations where there is a need to describe a decline in power or resilience. For example, one might say that the army's morale was weakened after suffering a string of defeats. Alternatively, one might say that a building's structural integrity was diminished after years of neglect.