The antonyms for the word "more sweet-smelling" are numerous, and they all convey opposite meanings that negate the pleasant aroma. Some of the most common antonyms for sweet-smelling include pungent, stinky, foul, malodorous, putrid, rank, reeking, rancid, and fetid. These antonyms are often used to describe unpleasant smells and odors that can cause disgust and nausea. For instance, the stench of rotting garbage or a sewer can be described as pungent, which is the complete opposite of sweet-smelling. Thus, the antonyms for sweet-smelling help to create a vivid contrast between pleasant and unpleasant odors to enhance the quality of language and communication.