いしはくじゃく
weak-willed; lacking a purpose; lacking will power to be patient, purposeful, or resolute
Na-adjective, No-adjective, Noun
こいつは意志薄弱いしはくじゃくな男おとこです。
He's a weak-willed man.
早はやくも、意志薄弱いしはくじゃくぶりを発揮はっきした。
He's already shown his weak-willed nature.