The antonyms for the word "more unsmelling" would be words that describe a strong or unpleasant smell, such as smelly, pungent, foul, rank, rancid, putrid, malodorous or stinky. These words are commonly used to describe a variety of things, including food, animals, human body odors, and environmental factors such as pollution or garbage. By contrast, the opposite of "more unsmelling" would be words that describe a pleasant or neutral scent, such as fragrant, sweet, fresh, pleasant, or mild. These words are often used to describe flowers, perfumes, or clean and fresh air.