The Collaborative International Dictionary of English v.0.48:

hick \hick\ n.
   A person who is not very intelligent or interested in
   culture; a hayseed.

   Syn: yokel, rube, yahoo, hayseed, bumpkin, chawbacon.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

hick \hick\ adj.
   1. rural. Opposite of urban.
      [WordNet 1.5]

   2. characteristic of rural people, especially those not
      knowledgeable about matters outside their locality; as,
      hick ideas; a hick town.

   Syn: bumpkinly, rustic, unsophisticated.
        [WordNet 1.5] hickey

WordNet (r) 3.0 (2006):

hick
    adj 1: awkwardly simple and provincial; "bumpkinly country
           boys"; "rustic farmers"; "a hick town"; "the nightlife of
           Montmartre awed the unsophisticated tourists" [syn:
           bumpkinly, hick, rustic, unsophisticated]
    n 1: a person who is not very intelligent or interested in
         culture [syn: yokel, rube, hick, yahoo, hayseed,
         bumpkin, chawbacon]