The Collaborative International Dictionary of English v.0.48:

Obedient \O*be"di*ent\, a. [OF. obedient, L. obediens,
   oboediens, -entis. p. pr. of obedire, oboedire, to obey. See
   Obey.]
   Subject in will or act to authority; willing to obey;
   submissive to restraint, control, or command.
   [1913 Webster]

         And floating straight, obedient to the stream. --Shak.
   [1913 Webster]

         The chief his orders gives; the obedient band,
         With due observance, wait the chief's command. --Pope.
   [1913 Webster]

   Syn: Dutiful; respectful; compliant; submissive.
        [1913 Webster]

WordNet (r) 3.0 (2006):

obedient
    adj 1: dutifully complying with the commands or instructions of
           those in authority; "an obedient soldier"; "obedient
           children"; "a little man obedient to his wife"; "the
           obedient colonies...are heavily taxed; the refractory
           remain unburdened"- Edmund Burke [ant: disobedient]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "obedient":
   abject, accepting, accommodating, acquiescent, adaptable, adapting,
   adaptive, adjustable, adjusting, agreeable, amenable, assenting,
   biddable, complaisant, compliable, compliant, complying,
   conformable, conforming, conscientious, consenting, deferential,
   devoted, docile, duteous, dutiful, ethical, faithful, flexible,
   humble, law-abiding, loyal, malleable, meek, moral, nondissenting,
   nonresistant, nonresisting, nonresistive, obeisant, observant,
   other-directed, passive, plastic, pliant, reconciled, resigned,
   respectful, scrupulous, servile, sheeplike, submissive,
   subservient, supine, timid, tractable, unassertive, uncomplaining,
   unresistant, unresisting, willing, yielding