momentary; temporary
His third novel proved an enormous success, but that success was transient, and he died in poverty twenty years later without ever again writing a bestseller.
trans (over, across)#ire (to go) (Latin)
ephemeral, evanescent, transient, transitory
enduring, immutable, perennial
remember transient light and transient current. that we studied in physics. which produce an effect for a very short time.