There are several synonyms for the phrase "become debilitated," which means to become weak or feeble. These include "weakened," "enfeebled," "impaired," "frail," and "infirm." Each word suggests a different level of weakness or incapacity. "Weakened" implies a loss of strength or power, while "enfeebled" suggests a more severe loss of both physical and mental abilities. "Impaired" can refer to a specific function, such as impaired vision or hearing. "Frail" implies a fragility or delicateness, and "infirm" suggests a longer-term and more serious illness or disability. All of these words convey a sense of vulnerability and weakness, but they differ in their nuances and connotations.