Hiraeth is a Welsh word with no precise English synonym or equivalent. I take it to mean a form of spiritual desolation formed by a nostalgia for a home we never had. How life was before the fall from grace and into the realm of mortality. A pre-lapsarian sense of the beauty of the garden of Eden: a time out of time, and a place out of place. I think it describes a widespread sense of spiritual homelessness and desolation common in the 21st century.