Acanthous is a term used to describe something that is spiny or thorny in nature. Its antonyms would, therefore, be words that describe the opposite of spiny or thorny. Examples of antonyms for acanthous include smooth, soft, and flat. Other antonyms could be gentle, rounded, or polished. Acanthous often refers to plants, but it can also be used to describe other objects or surfaces that are covered in sharp, pointed protrusions. By contrast, its antonyms suggest a sense of calmness, smoothness, and simplicity. Using a range of vocabulary can help to create rich, descriptive language and convey precise meanings.