One antonym for the word "cohabiting" is "living separately." This means that individuals are not living together under the same roof, but rather in different locations. Another antonym could be "living apart," which also signifies that individuals are not residing together. Additionally, some other antonyms for cohabiting could include "individual living," "lone living," or "living alone." These words describe a situation where one is living without a partner or roommate. It's important to note that the opposite of cohabiting does not necessarily imply a negative connotation, but rather a different living situation that may suit one's preferences or lifestyle.