The term 'unrelated' can be defined in a variety of ways, including 'INAPPLICABLE' (12 letters), 'UNCONNECTED' (11 letters), 'IRRELATIVE' (10 letters), 'IRRELEVANT' (10 letters), 'EXTRANEOUS' (10 letters), and 'DISCRETE' (8 letters). In general, these words all refer to something that is not connected or relevant to a particular situation. For example, an unrelated topic might be discussed in a conversation that has nothing to do with the original topic. Similarly, an unrelated object might be found in a place where it does not belong.