Detailed Instructions: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Q: Question: This is a question for English wordsmiths. Is there a word that "feels" like the word "ethereal" that means something ethereal that quickly disappears. Or is "ethereal" the correct word choice for this? Ethereal was the first word that popped into my head for this. From the various definitions that I've looked at for ethereal, it says delicate, beautiful, heavenly, etc. but not necessarily quickly vanishing, except for the secondary definitions related to ether that suggests it evaporates. I'm just wondering if there is a better word than this. I'm using the term "ethereal skill" to describe a certain type of pilot skill (instrument flying) that requires tremendous practice to achieve proficiency, and once proficiency is achieved it is a beautiful thing, but if you don't practice it regularly, that skill vanishes after a few weeks. USAGE: Instrument proficiency is an ethereal skill that once obtained must be maintained through constant and regular practice. 
Answer: evanescent is a good match - definitions focus on loss and vaporous qualities. It seems to be applied most often to the loss of things with positive connotation. MW defines it with : "tending to vanish like vapor", Cambridge with "lasting for only a short time, then disappearing quickly and being forgotten" Century Dictionary Online has a number of useful definitions and quotes. I like "Vanishing or apt to vanish or be dissipated, like vapor; passing away; fleeting: as, the pleasures and joys of life are evanescent. Also from Century, this quote: "He [Wordsworth] seems to have caught and fixed forever in immutable grace the most evanescent and intangible of our intuitions, the very ripple-marks on the remotest shores of being." - Lowell, Among my Books.
A:
no