Adjective : the ephemeral joys of childhood. ,an ephemeral flower.    From Dictionary.com. 

This intensity of perception is largely the result, or the cause, of the poet's unusually sensitive consciousness of the ephemeralness of love.    From Wordnik.com.  [The Poet's Poet : essays on the character and mission of the poet as interpreted in English verse of the last one hundred and fifty years] Reference

Reading the Parable of the Old Man and the Sock by Irving Karchmar, a dervish and novelist, made me reflect (once again) on the ephemeralness of life.    From Wordnik.com.  [Fahad Faruqui: Ramadan: Raising Spiritual and Financial Stocks?] Reference

The very ephemeralness of a online version will keep it from becoming the dominant form.    From Wordnik.com.  [best minimum wage job a middle aged guy ever had] Reference

I think about the seasons of life and the ephemeralness (is that a word?) of it every day.    From Wordnik.com.  [RSSMicro Search - Top News on RSS Feeds] Reference

The film becomes a lovely elegy to both youth and age, to the fleeting ephemeralness of, you know, everything: love, friendship, wisdom.    From Wordnik.com.  [FlickFilosopher.com] Reference

A kind of distinction to what are simply pamphlets or text-books that have been preserved by accident from the ephemeralness which was the common lot of hundreds of their fellows.    From Wordnik.com.  [English Literature: Modern Home University Library of Modern Knowledge] Reference

Discontent with ephemeralness of passion.    From Wordnik.com.  [The Poet's Poet : essays on the character and mission of the poet as interpreted in English verse of the last one hundred and fifty years] Reference