The word "beastlier" refers to something that is more beastly or animalistic in nature. The antonyms for this term can vary depending on the context in which it is being used. In general, antonyms for beastlier would include words that suggest kindness or refinement, such as gentle, humane, refined, civilized, or cultured. Other possible antonyms for beastlier might include words that suggest spirituality or enlightenment, such as enlightened, spiritual, or transcendent. Ultimately, the best antonym for beastlier will depend largely on the specific context in which the word is being used, and the desired connotations and tone of the communication.