Most sweet-smelling is an adjective that describes something that has a pleasant, fragrant odor. Antonyms for most sweet-smelling would be foul-smelling, pungent, malodorous or stinky. A foul-smelling object has an unpleasant stench that can make people feel sick or uncomfortable. Pungent means a smell that is strong and sharp; it may be spicy, bitter, or biting. Malodorous also means smelly, but in a bad way, which is often unbearable. The smell of something that's stinky is unpleasant and has a somewhat offensive odor. Antonyms are words that mean the opposite of each other. Therefore, most sweet-smelling and its antonyms are two different descriptors of smell.