Answer: ephemeral

AnswerCrossword Clue
EPHEMERALFleeting
EPHEMERALShort-lasting
EPHEMERALShort-lived
EPHEMERALPassing
EPHEMERALHere today, gone tomorrow
EPHEMERALNot long
EPHEMERALTransient.
EPHEMERALShort-lived.
EPHEMERALTransitory
EPHEMERALEvanescent
ephemeralexisting only for a day, or short period / a creature, such as a mayfly, that lives for one day only
ephemerallasting a very short time