"Stubblier" is a comparative adjective used to describe an object or person having more stubble than another. Antonyms for this word would include "clean-shaven," "beardless," or "smooth-faced." These words describe someone or something with little to no facial hair, the opposite of having excess stubble.
Other antonyms could include "polished," "groomed," or "neat," as these words suggest being tidy and well-kempt, as opposed to having the scruffy appearance that stubble often gives. Additionally, "bald," "hairless," or "smooth" could be considered antonyms, as they describe a surface free from hair or roughness. When searching for the opposite of "stubblier," consider words that connote smoothness or a lack of hair.