The Collaborative International Dictionary of English v.0.48:

frail \frail\, a. [Compar. frailer (fr[=a]l"[~e]r); superl.
   frailest.] [OE. frele, freile, OF. fraile, frele, F.
   fr[^e]le, fr. L. fragilis. See Fragile.]
   1. Easily broken; fragile; not firm or durable; liable to
      fail and perish; easily destroyed; not tenacious of life;
      weak; infirm.
      [1913 Webster]

            That I may know how frail I am.       --Ps. xxxix.
                                                  4.
      [1913 Webster]

            An old bent man, worn and frail.      --Lowell.
      [1913 Webster]

   2. Tender. [Obs.]
      [1913 Webster]

            Deep indignation and compassion frail. --Spenser.
      [1913 Webster]

   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.
      [1913 Webster]

            Man is frail, and prone to evil.      --Jer. Taylor.
      [1913 Webster]