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." “你喜欢这个新沙发吗？”“非常喜欢，它太特别了。”

[ + to infinitive ] It's unusual to have adult conversation like that with such a young child. 和这么小的孩子进行这么成人化的交谈，真不寻常。

I was actually on time, which is unusual for me. 我竟然很准时，这对我来说是少有的事。