The antonyms for the word "most gravelly" could be "smooth", "soothing", "silky", or "polished". While "most gravelly" may refer to a rough, harsh texture or sound, its antonyms would suggest something soft, comforting or refined. For example, a smooth voice could be considered antonymous to a gravelly one. A soothing melody would be the opposite of a gravelly, harsh noise. While most gravelly may be attractive to some, its antonyms appeal to those who enjoy smoothness and refinement. Ultimately, choosing the right word depends on the context in which it is used and the desired effect on the audience.