"an invalid's frail body"
"I'm only a fallible human" "frail humanity"
"a kite too delicate to fly safely" "fragile porcelain plates" "fragile old bones" "a frail craft"
The leniency of one who felt himself to be but frail.
A child of the frail Abbess of Leominster.
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)