EVANESCENT (adjective) - vanishing or likely to vanish like vapor
(from "100 Words Every High School Graduate Should Know" from the editors of the American Heritage Dictionaries
Used in a sentence:
from The Return of the Native - By Thomas Hardy, John William Cunliffe
"...All was unstable; quivering as leaves, evanescent as lightning ...."
(from www.brainyflix.com)
