The word "unrelated" is typically used to describe things that have no connection or similarity to each other. The antonyms for "unrelated" would be words that describe things that are connected or similar. These antonyms might include words such as "related," "connected," "similar," or "associated." For example, if you are talking about two different topics that seem unrelated, you might say that they are "unrelated," but if you find a connection between them, you could say that they are "related" or "connected." Similarly, if two things seem different but share some similarities, you might say that they are "similar" or "associated.