Catenate means to connect or link together in a chain-like manner. Some antonyms for catenate include disjoin, separate, unfasten, detach, and sever. These words are opposite in meaning as they imply breaking or loosening the connection between things. Disjoin suggests a complete and permanent separation, whereas unfasten refers to the loosening of something that was previously fastened. Similarly, detach implies removing something that was previously attached, and sever refers to cutting off or separating completely. These antonyms provide a range of options for expressing the opposite of linking or connecting things in a chain-like manner.