Synonyms of ephemeral

1 Syllable
short, brief
2 Syllables
supplier, arty, artier, fleeting, short-term, transient, short-haul, short-run, flitting, lamster, passing
3 Syllables
overnight, deciduous, short-lived, fugacious, fly-by-night, creatural, short-range, bipedal, meteoric
4 Syllables
evanescent, volatile, episodic, sublunary, fugitive, temporary, insubstantial, unenduring, momentary, transitory, impermanent, provisional
5 Syllables
undetectable, unobservable, imperceptible, inappreciable, provisionary, imponderable