The word "un-fleshlier" means lacking flesh or having a lean body. There are several synonyms for this term that can be used instead, such as thin, skinny, slender, lanky, angular, bony, emaciated, gaunt, haggard, and wasted. Each of these synonyms carries a slightly different connotation and may be more appropriate in certain contexts. For example, "lanky" suggests a tall and thin body while "emaciated" connotes extreme thinness and malnourishment. Overall, there are plenty of options for replacing "un-fleshlier" in your writing to make it more descriptive and nuanced.