weak; feeble; delicate; frail; helpless
か弱い声で助けを求めた。
Called for help in a feeble voice.
病気の後、祖母の腕はか弱かった。
After the illness, my grandmother's arms were frail.
見た目ほど彼女はか弱くない。
She is not as delicate as she looks.