When seeking synonyms for the expression "not valuable", a multitude of alternatives can help convey a similar meaning. Terms such as "worthless", "inconsequential", and "insignificant" all capture the notion of lacking worth or importance. Another option that reinforces this idea is "unimportant". Moreover, descriptors like "useless", "meaningless", and "trivial" stress the absence of value or significance. "Futile" and "fruitless" indicate that something lacks effectiveness or purpose, highlighting its lack of worth. In summary, the English language provides a plethora of synonyms to express the concept of something being "not valuable", ensuring a wide range of options to convey this sentiment in various contexts.