There are several synonyms for the word "smartier" that can be used to express intelligence or cleverness. Some of these include "brainier," "shrewder," "astuter," "more knowledgeable," "resourceful," "witty," and "quick-witted." Each of these descriptors highlights differing aspects of intelligence, from pure intellect to the ability to think on one's feet. Using a variety of synonyms can help a writer to convey nuance and specificity when discussing intelligence or cleverness in individuals or situations. Overall, the use of synonyms can help writers to avoid repetition and create a more engaging and interesting piece of writing.