The Collaborative International Dictionary of English v.0.48:

Worser \Wors"er\, a.
   Worse. [R.]
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         Thou dost deserve a worser end.          --Beau. & Fl.
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         From worser thoughts which make me do amiss. --Bunyan.
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         A dreadful quiet felt, and, worser far
         Than arms, a sullen interval of war.     --Dryden.
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   Note: This old and redundant form of the comparative occurs
         occasionally in the best authors, although commonly
         accounted a vulgarism. It has, at least, the analogy of
         lesser to sanction its issue. See Lesser. "The
         experience of man's worser nature, which intercourse
         with ill-chosen associates, by choice or circumstance,
         peculiarly teaches." --Hallam.
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