The Collaborative International Dictionary of English v.0.48:

Withal \With*al"\, adv. [With + all.]
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   1. With this; with that. [Obs.]
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            He will scarce be pleased withal.     --Shak.
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   2. Together with this; likewise; at the same time; in
      addition; also. [Archaic]
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            Fy on possession
            But if a man be virtuous withal.      --Chaucer.
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            If you choose that, then I am yours withal. --Shak.
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            How modest in exception, and withal
            How terrible in constant resolution.  --Shak.
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The Collaborative International Dictionary of English v.0.48:

Withal \With*al"\, prep.
   With; -- put after its object, at the end of sentence or
   clause in which it stands. [Obs.]
   [1913 Webster]

         This diamond he greets your wife withal. --Shak.
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         Whatsoever uncleanness it be that a man shall be
         defiled withal.                          --Lev. v. 3.
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WordNet (r) 3.0 (2006):

withal
    adv 1: despite anything to the contrary (usually following a
           concession); "although I'm a little afraid, however I'd
           like to try it"; "while we disliked each other,
           nevertheless we agreed"; "he was a stern yet fair
           master"; "granted that it is dangerous, all the same I
           still want to go" [syn: however, nevertheless,
           withal, still, yet, all the same, even so,
           nonetheless, notwithstanding]
    2: together with this