Frail, n.
Etymology: [OE. fraiel, fraile, OF. fraiel, freel, frael, fr. LL. fraellum.]
A basket made of rushes, used chiefly for containing figs and raisins.
2. The quantity of raisins -- about thirty-two, fifty-six, or seventy-five pounds, -- contained in a frail.
3. A rush for weaving baskets. Johnson.
1 other Webster entry under this spelling
Frail, a. [Compar. Frailer; superl. Frailest.]
1. Easily broken; fragile; not firm or durable; liable to fail and perish; easily destroyed; not tenacious of life; weak; infirm. That I may know how frail I am. Ps. xxxix. 4. An old bent man, worn and frail. Lowell.
2. Tender. [Obs.] Deep indignation and compassion. Spenser.
3. Liable to fall from virtue or be led into sin; not strong against temptation; weak in resolution; also, unchaste; -- often applied to fallen women. Man is frail, and prone to evil. Jer. Taylor.
Shades of meaning
Fernald lists frail only as an antonym, under healthy.
He lists it without comment; the entries above explain its neighbors.