1. 脆弱：frailly 脆弱地 | frailness 脆弱 | frailty 虚弱
2. 脆弱; 不坚定 (名)：frailly 脆弱地 (副) | frailness 脆弱; 不坚定 (名) | frailty 脆弱, 虚弱; 弱点, 缺陷 (名)
noun
1. frailness
1. the state of being weak in health or body (especially from old age)
Synonym: infirmity frailty debility feebleness valetudinarianism