The antonyms of the word "more weighted" are unimportant, lightweight, and insignificant. These words convey the opposite meaning of "more weighted," which suggests a greater importance or significance. An unimportant matter would be the opposite of a more weighted matter, indicating that there is little or no significance attached to it. Lightweight objects or ideas have little weight, and thus would not be considered more weighted. Similarly, insignificant ideas or matters lack importance and, therefore, are not more weighted. In sum, these antonyms provide a range of options for describing things that are less significant or weighty than those that are more weighted.