The Collaborative International Dictionary of English v.0.48:

Lewd \Lewd\ (l[=u]d), a. [Compar. Lewder (-[~e]r); superl.
   Lewdest.] [OE. lewed, lewd, lay, ignorant, vile, AS.
   l[=ae]wed laical, belonging to the laity.]
   1. Not clerical; laic; laical; hence, unlearned; simple.
      [Obs.]
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            For if a priest be foul, on whom we trust,
            No wonder is a lewed man to rust.     --Chaucer.
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            So these great clerks their little wisdom show
            To mock the lewd, as learn'd in this as they. --Sir.
                                                  J. Davies.
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   2. Belonging to the lower classes, or the rabble; idle and
      lawless; bad; vicious. [Archaic] --Chaucer.
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            But the Jews, which believed not, . . . took unto
            them certain lewd fellows of the baser sort, . . .
            and assaulted the house of Jason.     --Acts xvii.
                                                  5.
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            Too lewd to work, and ready for any kind of
            mischief.                             --Southey.
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   3. Given to the promiscuous indulgence of lust; dissolute;
      lustful; libidinous. --Dryden.
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   4. Suiting, or proceeding from, lustfulness; involving
      unlawful sexual desire; as, lewd thoughts, conduct, or
      language.
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   Syn: Lustful; libidinous; licentious; profligate; dissolute;
        sensual; unchaste; impure; lascivious; lecherous;
        rakish; debauched. -- Lewd"ly, adv. -- Lewd"ness, n.
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WordNet (r) 3.0 (2006):

lewdly
    adv 1: in a lewd and obscene manner; "he had seen how in their
           dances the white men and women held one another
           obscenely" [syn: lewdly, obscenely]