Un-common is a word used to describe something that is not frequent or usual. However, there are several antonyms for this term, which could be useful in expanding our vocabulary. One antonym for un-common is "common," which means something is occurring frequently or widely recognized. Another antonym is "usual," meaning an occurrence that is to be expected or anticipated. A third option could be "typical," which refers to a common or standard example. In conclusion, learning antonyms for un-common can provide us with a broader range of vocabulary to accurately describe the world around us.