Evanescent is a formal and literary word that describes something that only lasts a very short time.

// Our acting coach always reminded us that fame is evanescent, and that we should pursue a life in the theater purely for the love of the art.

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"Franklin once sternly confiscated a customer's espresso and refunded his money because he took too long sipping it and thus allowed the evanescent flavors to dissipate." — Kirkus Reviews, 8 Jan. 2026

Evanescent didn't appear in the English language out of thin air; it comes from a form of the Latin verb evanescere, which means "to fade away" or "to disappear." (Evanescere is also the ultimate source of vanish.) Given the similarity in spelling and meaning between the two words, you might expect evaporate to trace back to evanescere as well, but its source is another steamy Latin root, evaporare. While today evanescent is used to describe things that last only a short time, the word could formerly also describe the incalculably small. That use is now archaic, meaning it has almost blown away on the breeze.