The phrase "more girdered" implies something that has more supports in place. Synonyms for "more girdered" could include "reinforced," "strengthened," "bolstered," "fortified," or "braced." These words all suggest an increase in stability and durability. Another possible synonym is "buttressed," which specifically refers to a structure that is supported by external buttresses or braces. Depending on the context in which "more girdered" is being used, other synonyms could include "secured," "fastened," or "anchored." Regardless of the specific word chosen, the overall meaning remains the same - there is a greater sense of security and stability present.