The phrase "hast a weight of" means to possess a certain amount of mass or heaviness. Antonyms for this phrase would be words that describe a lack of weight or lightness. These antonyms could include terms such as "light," "featherweight," "flimsy," "insubstantial," "hollow," or "weightless." These words carry connotations of fragility, delicacy, and airiness, and are used to describe objects or substances that are not dense or substantial. By contrast, words that are synonymous with "hast a weight of" would include terms such as "dense," "heavy," "ponderous," or "burdensome." These words describe objects or substances that are substantial and have a significant mass or weight.