Anteriors refer to the front teeth in human beings, and there are several antonyms or opposite words for this term. The first antonym is "posterior," which means pertaining to the back teeth. Another antonym is "inferior," which describes the lower teeth in a human's mouth. The third one is "distal," which means positioned away from the center of the body. In contrast, the fourth antonym, "proximal," depicts the positional relationship of the teeth close to the median line of the body. The fifth antonym is "dorsal," which relates to the common location of the back teeth in the oral cavity. Finally, the sixth antonym is "ventral," which alludes to the position of the front teeth below the nose.