The word "more fortifying" implies strength and resilience. However, there are antonyms that signify weakness and fragility. Such antonyms include "weakening," "enervating," "debilitating," "deteriorating," and "enfeebling." If something is weakening, it means that it is losing its strength and becoming more fragile. Enervating is another antonym that means causing weakness or exhaustion. Something that is debilitating makes a person or thing weak and unable to function effectively. Deteriorating means becoming worse over time, and enfeebling describes the condition of being weak or feeble. These antonyms can be used to describe something that is less fortifying, inefficient, or unable to resist external forces.