slavishly

from WordNet (r) 3.0 (2006)

slavishly
    adv 1: in a slavish manner; "his followers slavishly believed in
           his new diet"

from 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]