airy-fairy
adjective UK informal uk/ˌeə.riˈfeə.ri/ us/ˌer.iˈfer.i/
想象出来的；不切实际的；空洞的
not practical or not based on the situation as it really is
She's talking about buying an old castle in Ireland. It all sounds a bit airy-fairy to me. 她说要在爱尔兰买一座古堡。可我觉得她说的这些有点儿不切实际。