The antonyms for the word "unsmiling" are numerous and diverse, ranging from positive and happy terms to more neutral or somber ones. Some examples of antonyms for "unsmiling" can include cheerful, grinning, beaming, joyful, radiant, elated, laughing, humorous, jocular, and lively. Other antonyms could be serene, content, placid, tranquil, peaceful, calm, or satisfied, which have a more subdued and peaceful connotation. Nonetheless, antonyms for "unsmiling" would indicate the opposite of a person's facial expression or demeanor, suggesting a more positive, happy, or calm state of mind. Ultimately, the right choice of antonym depends on the context and intended meaning of the text.