The Collaborative International Dictionary of English v.0.48:

Lecherous \Lech"er*ous\, a.
   Like a lecher; addicted to lewdness; excessively lustful; --
   used mostly of men; also, lust-provoking. "A lecherous thing
   is wine." --Chaucer. -- Lech"er*ous*ly, adv. --
   Lech"er*ous*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lecherous
    adj 1: given to excessive indulgence in sexual activity; "a
           lecherous gleam in his eye"; "a lecherous good-for-
           nothing"

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "lecherous":
   animal, aphrodisiomaniacal, bawdy, carnal, clitoromaniacal,
   concupiscent, decadent, degenerate, depraved, dirty, dirty-minded,
   dissolute, erotic, eroticomaniacal, erotomaniacal, fleshly,
   goatish, gynecomaniacal, hircine, horny, hot, hysteromaniacal,
   ithyphallic, lascivious, lewd, libertine, libidinous, licentious,
   lickerish, lubricious, lubricous, lustful, nymphomaniacal, obscene,
   priapic, profligate, prurient, randy, salacious, satyric, sensual,
   sexual, sexy, wanton