The Collaborative International Dictionary of English v.0.48:

Slavish \Slav"ish\, a.
   Of or pertaining to slaves; such as becomes or befits a
   slave; servile; excessively laborious; as, a slavish life; a
   slavish dependance on the great. -- Slav"ish*ly, adv. --
   Slav"ish*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

slavish
    adj 1: blindly imitative; "a slavish copy of the original"
    2: abjectly submissive; characteristic of a slave or servant;
       "slavish devotion to her job ruled her life"; "a slavish yes-
       man to the party bosses"- S.H.Adams; "she has become
       submissive and subservient" [syn: slavish, subservient,
       submissive]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "slavish":
   abused, apish, base, browbeaten, difficult, downtrod, downtrodden,
   emulative, formidable, ground down, heavy, henpecked, imitative,
   in leading strings, knotty, laborious, mean, menial, miserable,
   misused, obeisant, obsequious, operose, oppressed, ordered around,
   overborne, regimented, rough, rugged, servile, spineless,
   strenuous, subdued, submissive, subservient, tame, trampled,
   tyrannized, uninspired, unmanned, unoriginal, wretched