Barbate is an adjective that means having a beard or hairy. Its antonym, therefore, would be unbearded or hairless. Other antonyms of barbate could be smooth, bald, shaven or depilated. It's important to note that some antonyms may be context-dependent. For example, in certain contexts, barbate and unbearded might not be opposites. If the context involves discussing the absence or presence of facial hair, they'll certainly be antonyms. However, if the context includes discussing some ambiguous term like "manliness," then the two words may not be clear antonyms. A useful tip is to read through the context before selecting an antonym for a word.