Adjective

… several rather inflated pages of material about an ephemeral love affair Fitzgerald allegedly had with an English woman named Bijou … — Joyce Carol Oates , Times Literary Supplement ,

As a consequence North Africa was easily reconquered by the Byzantine emperor in the 530s, and the Vandals' influence on North African development was ephemeral and negligible. — Norman F. Cantor , The Civilization of the Middle Ages ,

This accounts for the peculiar sense most observers have that the ephemeral , sensationalist, polymorphous, magpie popular culture of the United States is at bottom remarkably conservative … — Louis Menand , Harper's ,

the autumnal blaze of colors is always to be treasured, all the more so because it is so ephemeral