Heathenishly is an adverb that describes something or someone that behaves in a barbaric or uncivilized manner. If you're looking for synonyms for this word, there are plenty of options available to choose from. Some popular choices include savagely, uncouthly, rudely, primitively, and uncivilly. Other excellent options that might help you to convey the same meaning include barbarously, boorishly, crudely, and unculturedly. Whether you're looking to describe someone's behavior or simply want to express your distaste for an action or situation, these synonyms for heathenishly can help you to do so in a more eloquent and nuanced way.