Barbellate is an adjective that refers to having small, sharp, hooked projections. It is derived from the Latin word "barbula," which means small hook. Some antonyms for barbellate would be smooth, flat, unhooked, blunt, or rounded. For example, a barbellate fishhook has sharp barbs to catch fish, while an unhooked fishing line does not. A barbellate plant has thorns to protect against predators, while a smooth plant does not. In summary, antonyms for barbellate are words that describe things that do not have small, sharp, hook-like projections.