"ephemeral" in the noun sense
1. ephemeron, ephemeral
anything short-lived, as an insect that lives only for a day in its winged form
"ephemeral" in the adjective sense
1. ephemeral, passing, short-lived, transient, transitory, fugacious
lasting a very short time
"the ephemeral joys of childhood"
"a passing fancy"
"youth's transient beauty"
"love is transitory but it is eternal"
"fugacious blossoms"
Source: WordNet® (An amazing lexical database of English)
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