The Collaborative International Dictionary of English v.0.48:

Obeisant \O*bei"sant\, a. [F. ob['e]issant, p. pr. of ob['e]ir
   to obey.]
   Ready to obey; reverent; deferential; also, servilely
   submissive.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "obeisant":
   abject, backscratching, beggarly, bootlicking, cowering, crawling,
   cringing, crouching, deferential, fawning, flattering, footlicking,
   groveling, hangdog, ingratiating, mealymouthed, menial, obsequious,
   on bended knee, parasitic, prone, prostrate, servile, slavish,
   sniveling, sponging, submissive, subservient, sycophantic,
   timeserving, toadeating, toadying, toadyish, truckling