caducity
/kəˈdjuːsətɪ/noun
mass noun
1- archaic the infirmity of old age; senility〈古〉年老体弱; 衰迈。
1.1
- poetic/literary frailty or transitory nature〈诗/文〉虚弱; 易逝性：
read these books and reflect on their caducity.
读读这些书, 想想它们的易逝性。
词源
mid 18th cent.: from French caducité, from caduc, from Latin caducus 'liable to fall', from cadere 'to fall'.