Antonyms for the phrase "be contiguous to" may include words such as distant, separated, detached, apart, isolated, and disconnected. When two things are contiguous to each other, they touch or are adjacent to one another. However, when they are distant or separated, there is a gap or distance between them. Detached refers to two things that were once together but are now disconnected, while apart means they are separate from each other. Isolated and disconnected both suggest that two things are not physically connected or related in any way. All of these words could be used as antonyms for "be contiguous to," depending on the specific context and situation.