Source : Webster's Revised Unabridged Dictionary (1913)

Groveler \Grov"el*er\, n.
   One who grovels; an abject wretch. [Written also
   --groveller.]

Source : WordNet®

groveler
     n : someone who humbles himself as a sign of respect; who
         behaves as if he had no self-respect [syn: {apple
         polisher}, {bootlicker}, {fawner}, {groveller}, {truckler},
          {ass-kisser}]