The term sweetsmelling implies something that has a pleasant or pleasing fragrance or scent. The antonyms for the word sweetsmelling would include terms that describe unpleasant or unappealing smells. These include terms like pungent, putrid, foul, rancid, malodorous, musty, stale, stale-smelling, and foul-smelling. Other antonyms for the term sweetsmelling may include words or phrases that describe a lack of scent or smell, such as odorless, scentless, or fragrance-free. Understanding antonyms for common words can help to expand one's vocabulary and enhance communication skills.