frailness 

英汉解释

n. 脆弱；不坚定

同义词

n. debility，feebleness，frailty，infirmity

参考例句

1. The frailness of the child from the birth made her susceptible to every prevailing illness.
这个孩子天生的虚弱，使她易于罹患每一种流行的疾病。
2. Timidity, frailness, sullenness, viciousness, lack of animation, cumbersome appearance and lack of over-all balance impair the general character.
胆怯、脆弱、易怒、缺少生气、外观笨重、缺乏整体平衡都会削弱柯利犬的整体外观得分。
3. Psychologists say someone who never says no shows his phenomenon of psychological frailness in interpersonal interaction, which is an immature behavior.
心理学家说，不会说不，这是人际交往中心理脆弱的表现，是不成熟的行为。

英英解释

n.
  1. the state of being weak in health or body (especially from old age)

网络释义

frailness
脆弱;
flimsiness fragility frailness frailty frangibility friability
脆弱;