The phrase "tried for size" implies an attempt to fit or test something. Its antonyms include "ignored," "rejected," and "dismissed." If something is ignored, it is disregarded or considered insignificant, and no attempt is made to test or assess it. When something is rejected, it is refused or turned down after being considered. And, if something is dismissed, it is considered unimportant or irrelevant and disregarded as such. These antonyms suggest a lack of effort towards exploring, assessing or testing a particular object or idea, and instead, paying no attention or disregarding it altogether.