The Collaborative International Dictionary of English v.0.48:

Belabor \Be*la"bor\, v. t. [imp. & p. p. Belabored; p. pr. &
   vb. n. Belaboring.]
   1. To ply diligently; to work carefully upon. "If the earth
      is belabored with culture, it yieldeth corn." --Barrow.
      [1913 Webster]

   2. To beat soundly; to cudgel.
      [1913 Webster]

            Ajax belabors there a harmless ox.    --Dryden.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "belabored":
   alliterating, alliterative, assonant, chanting, chiming,
   cliche-ridden, dingdong, harping, humdrum, jingle-jangle, jog-trot,
   labored, monotone, monotonous, rhymed, rhyming, singsong,
   tedious