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]