Animalistically is an adverb that is used to describe behavior that is akin to that of an animal. Some synonyms for the word include zoologically, brutishly, instinctually, bestially, and feral. These words all convey a sense of raw, primal, and untamed behavior that is characteristic of many animals. Other similar terms that could be used to describe animalistic behavior might include savage, ferocious, untamed, and wild. Whether describing the behavior of a human or an animal, the use of these words is sure to convey a sense of raw power and untamed energy that can be both thrilling and dangerous.