The word "interfaced" means to connect or communicate with another person, device or system. Antonyms for "interfaced" would be words that convey a lack of connection or communication. Some possible antonyms include "disconnected," "unlinked," "unplugged," "isolated," "separated," or "unattached." The opposite of interfacing implies that there is no interaction or coordination between the entities involved, which could be problematic in many contexts. For example, in computer technology, a lack of interfacing between components can cause glitches and system failures. In everyday communication, failing to interface with others can lead to misunderstandings, conflicts, and a breakdown of relationships.