The term "most roughhewn" refers to something that is unrefined or lacking in polish. Its antonyms would include words like refined, polished, smooth, elegant, sophisticated, cultivated, and cultured. These words suggest a certain level of finesse, detail, and artistry. A refined individual or object might possess an element of grace or poise, while a polished one might shine with a particular brilliance or clarity. In contrast, something that is "most roughhewn" may suggest a certain crudeness or roughness around the edges. Its antonyms suggest the opposite: sophistication, refinement, and polish, all of which convey a sense of elegance and class.