Fetching details from the dictionary...

fleeting; transient; short-lived; momentary; ephemeral; fickle; vain
empty (dream, etc.); mere (hope); faint (possibility)
果無い期待を抱きながら待っていました。
I had fleeting expectations.
戦場での兵士たちの命は果無かった。
The lives of soldiers on the battlefield were fleeting.
努力で得た成果は果無くないと信じたい。
I want to believe that results earned through effort are not in vain.