(1)健康面や身体面で弱い状態（特に年を取ってからの）
(2)強さや中身が欠けている特性
(3)the state of being weak in health or body (especially from old age)
(4)the quality of lacking intensity or substance; "a shrill yet sweet tenuity of voice"- Nathaniel Hawthorne
さらに詳しく
