ephemeral
/ ˈef.ə.mɚ.əl /
Adjective
Noun
Origin
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Lasting for a very short time. Common"Fashions are ephemeral, changing with every season."
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(Of a plant) having a life-cycle of only one day. Botany"The ephemeral beauty of the morning glory fades by noon."
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Lacking the qualities to last for a long time.