Sentence:  A century ago , Newman saw that liberalism ( what we now might call secularism ) would gradually but definitely make its mark on English Protestantism , and that even high Anglicanism would someday no longer be a `` serviceable breakwater against doctrinal errors <WSD>more</WSD> fundamental than its own '' . 
Meaning of the word marked with <WSD> tags:  (comparative of `much' used with mass nouns) a quantifier meaning greater in size or amount or extent or degree