reclusive

from WordNet (r) 3.0 (2006)

reclusive
    adj 1: withdrawn from society; seeking solitude; "lived an
           unsocial reclusive life" [syn: {recluse}, {reclusive},
           {withdrawn}]
    2: providing privacy or seclusion; "the cloistered academic
       world of books"; "sat close together in the sequestered
       pergola"; "sitting under the reclusive calm of a shade tree";
       "a secluded romantic spot" [syn: {cloistered}, {reclusive},
       {secluded}, {sequestered}]

from The Collaborative International Dictionary of English v.0.48

Reclusive \Re*clu"sive\ (r[-e]*kl[=u]"s[i^]v), a.
   1. Affording retirement from society. "Some reclusive and
      religious life." --Shak.
      [1913 Webster]

   2. Disposed to avoid the company of other people; living like
      a recluse[1]; not sociable; -- of people.
      [PJC]