The word "cooccurring" refers to two or more events or conditions happening at the same time. Some antonyms that can be used to describe the opposite of "cooccurring" are "separate", "isolated", "distinct", "unrelated", "independent" and "unconnected". These words indicate a clear distinction between two events or conditions that are happening independently of each other. For example, instead of saying two diseases are cooccurring, one could say they are completely unrelated. In the field of mental health, the term "comorbid" is often used as a synonym for cooccurring, but antonyms for this word include "unrelated" or "independent".