The Collaborative International Dictionary of English v.0.48:

Unworth \Un*worth"\ ([u^]n*w[^u]th"), a. [AS. unweor[eth].]
   Unworthy. [Obs.] --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unworth \Un*worth"\, n.
   Unworthiness. [R.] --Carlyle.
   [1913 Webster]