1) Ephemeral 2) Falling or fading early 3) Fleeting 4) Impermanent 5) Lasting a very short time 6) Passing 7) Short-lived 8) Temporary 9) Transient 10) Transitory 1) Ephemeral 2) Impermanent 3) Passing 4) Temporary 5) Transitory 
soon withering
inclined to run away or flee
• (a.) Flying, or disposed to fly; fleeing away; lasting but a short time; volatile. • (a.) Fleeting; lasting but a short time; -- applied particularly to organs or parts which are short-lived as compared with the life of the individual.
short-lived; in flowers referring to those which last a few hours or less.
Falling or withering away very early. ... (09 Oct 1997) ... 
Fu·ga'cious adjective [ Latin fugax , fugacis , from fugere : confer French fugace . See Fugitive .] 1. Flying, or disposed to fly; fleeing away; lasting but a short time; volatile. « Much of its possessions is so hid, so fugacious, and of so uncertai...
Falling or withering away very early.
soon withering
fleeting; transitory: a sensational story with but a fugacious claim on the public's attention. · falling or fading early.