Pileous is an adjective that refers to something that is hairy or covered in fine hairs. Its antonyms, on the other hand, describe something that is bald, smooth, or hairless. Some of the most commonly used antonyms for pileous include words like smooth, bald, sleek, hairless, and glabrous. Other antonyms that fit the context and have similar meanings include shiny, polished, and glossy. These antonyms are used to help describe a wide variety of objects or animals that do not have hair or fur, including human heads, tabletops, and certain types of skin.