different from others of the same type in a way that is surprising, interesting, or attractive: "Do you like the new couch ?" "Yes, it's very unusual." [ + to infinitive ] It's unusual to have adult conversation like that with such a young child.

different from what is usual or normal synonym uncommon The case is highly unusual. Police then took the unusual step of publishing the names and pictures of the two suspects. it is unusual for somebody/something to do something It's not unusual for young doctors to work a 70-hour week (= it happens often).

If something is unusual in an interesting and slightly odd way, you can use the words quirky or offbeat. He has a very quirky sense of humour. The film is an offbeat romantic comedy. If a person is very unusual in a nice way, you can say that they are one of a kind.