The Collaborative International Dictionary of English v.0.48:

Lither \Li"ther\ (l[imac]"[th][~e]r), a. [AS. l[=y][eth]er bad,
   wicked.]
   Bad; wicked; false; worthless; slothful. [Obs.] --Chaucer.
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         Not lither in business, fervent in spirit. --Bp.
                                                  Woolton.
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   Note: Professor Skeat thinks " the lither sky" as found in
         Shakespeare's Henry VI. ((Part I. IV. VII., 21) means
         the stagnant or pestilential sky. -- Li"ther*ly, adv.
         [Obs.]. -- Li"ther*ness, n. [Obs.]
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