Fetching details from the dictionary...

fleeting; transient; short-lived; momentary; ephemeral; fickle; vain
empty (dream, etc.); mere (hope); faint (possibility)
桜の花の儚い美しさに心を打たれた経験がある。
I have experienced being moved by the fleeting beauty of cherry blossoms.
桜の花が散る姿はやはり儚かった。
The sight of cherry blossoms scattering was indeed fleeting.
二人で過ごした時間は決して儚くなかった。
The time the two of us spent together was by no means fleeting.