The antonyms for the word "more unsmiling" can be several depending upon the context of its usage. If we consider the term "unsmiling" as a mood or disposition of someone, then the antonyms could be "smiling," "cheerful," "joyful," "happy," "pleasant," and "delightful." However, if we consider the term as an appearance, then the antonyms could be "smiling," "grinning," "beaming," "glowing," and "radiant." In both the cases, the antonyms indicate a positive and lively energy, which is the opposite of being unsmiling. Therefore, depending on the context, the antonyms for the word "more unsmiling" can vary, but they all suggest a positive and vibrant mood.