fugacious \fyoo-GAY-shuhs\, adjective:
Lasting but a short time; fleeting.
As the rain conspires with the wind to strip the fugacious glory of the cherry blossoms, it brings a spring delicacy to our dining table.
— Sarah Mori, “A spring delicacy”, Malaysian Star
The thick, palmately lobed lead is lapped around the bud, which swiftly outgrows its protector, loses its two fugacious sepals, and opens into a star-shaped flower, one to each stem, with several fleshy white petals and a mass of golden stamens in the center.
— Alma R. Hutchens, A Handbook of Native American Herbs
When he proposed the tax in May, Altman thought it would follow the fugacious nature of some flowers: bloom quickly and die just as fast.
— Will Rodgers, “Parks proposal falls on 3-2 vote”, Tampa Tribune, June 27, 2001
Fugacious is derived from Latin fugax, fugac-, “ready to flee, flying; hence, fleeting, transitory,” from fugere, “to flee, to take flight.” Other words derived from the same root include fugitive, one who flees, especially from the law; refuge, a place to which to flee back (re-, “back”), and hence to safety; and fugue, literally a musical “flight.”
The delerium on the left following the election of Obama was fugacious. Reality has now set in. As for the rest of us, our disdain for Obama is not what you would consider fugacious.