1. I-adjective (keiyoushi)

   fleeting; transient; short-lived; momentary; ephemeral; fickle; vain

   Usually written using kana alone

   人生は儚いよ、と人は言う。

2. empty (dream, etc.); mere (hope); faint (possibility)

   Usually written using kana alone

Also written 果敢無い【はかない】hakanai、果無い【はかない】hakanai