"Seeably" is a relatively uncommon word that essentially means "in a way that is visible or apparent." This definition suggests a number of synonyms that could be used in its place, such as "noticeably," "clearly," "obviously," "evidently," or "plainly." Other options might include "overtly," "manifestly," "prominently," or "transparently." All of these words convey a similar sense of something being readily visible or discernible in some way, whether through observation, analysis, or any other means. While "seeably" might not be the most familiar word, there are many viable synonyms available to convey the same idea.