Unendly is not a word in the English language, but if we consider the word "unending," its antonyms would be "ending," "conclusive," "finite," and "limited." If we take "unfriendly" as an alternative, then its antonyms would be "friendly," "affable," "amiable," and "pleasant." The opposite of "uninterested" could be "interested," "curious," "attentive," or "engaged." Similarly, "uncommon" could be replaced by "common," "regular," "ordinary," or "familiar." It is important to know the antonyms of words as they help us to get a better grasp of their meaning and provide us with more options for expressing ourselves.