The word "un-commonly" refers to something that is not very common or usual. Its antonyms can be commonly, usually, ordinarily, typically, or normally. These words signify something that is done or happens frequently or commonly. Commonly speaks of something that is widespread and frequent, usually is the norm or the standard way of doing things, ordinarily means it is within the bounds of what is expected, and typically denotes the things that are predictable or precedented. Therefore, these antonyms provide the opposite meaning of un-commonly and signify that something is regular, average, or representative of a general pattern.