The Collaborative International Dictionary of English v.0.48:

Boor \Boor\ (b[=oo]r), n. [D. boer farmer, boor; akin to AS.
   geb[=u]r countryman, G. bauer; fr. the root of AS. b[=u]an to
   inhabit, and akin to E. bower, be. Cf. Neighbor, Boer,
   and Big to build.]
   1. A husbandman; a peasant; a rustic; esp. a clownish or
      unrefined countryman.
      [1913 Webster]

   2. A Dutch, German, or Russian peasant; esp. a Dutch colonist
      in South Africa, Guiana, etc.: a boer.
      [1913 Webster]

   3. A rude ill-bred person; one who is clownish in manners.
      [1913 Webster]

WordNet (r) 3.0 (2006):

boor
    n 1: a crude uncouth ill-bred person lacking culture or
         refinement [syn: peasant, barbarian, boor, churl,
         Goth, tyke, tike]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "boor":
   Babbitt, Philistine, arriviste, backwoodsman, barbarian, blockhead,
   blunderer, blunderhead, boob, botcher, bounder, bourgeois, bucolic,
   buffoon, bumbler, bumpkin, bungler, cad, churl, clod, clodhopper,
   clodknocker, clot, clown, country bumpkin, dolt, epicier, farmer,
   fumbler, galoot, gawk, gawky, goop, gowk, groundling, guttersnipe,
   hayseed, hick, hillbilly, hooligan, hoyden, ill-bred fellow, klutz,
   looby, loon, lout, low fellow, lubber, lummox, mucker,
   nouveau riche, oaf, ox, parvenu, peasant, philistine, provincial,
   ribald, rough, roughneck, rowdy, rube, ruffian, rustic, slob,
   slouch, slubberer, swain, upstart, vulgarian, vulgarist, yahoo,
   yokel