"Un-customarily" refers to something that is not done in the usual way or is not typical. Antonyms for this word include those which express the opposite meaning, such as "regularly," "routinely," "commonly," or "normally." These words imply that the task or behavior being discussed is being done in a manner that is customary or standard. For example, if someone usually sleeps for eight hours but only slept for four hours, they would be sleeping un-customarily. Conversely, if they slept for eight hours as they usually would, it would be sleeping customarily. Therefore, the antonyms suggest the normal or typical way, while the original word suggests something that deviates from the norm.