The Collaborative International Dictionary of English v.0.48:

Confine \Con*fine"\ (k[o^]n*f[imac]n"), v. t. [imp. & p. p.
   Confined; p. pr. & vb. n. Confining.] [F. confiner to
   border upon, LL. confinare to set bounds to; con- + finis
   boundary, end. See Final, Finish.]
   To restrain within limits; to restrict; to limit; to bound;
   to shut up; to inclose; to keep close.
   [1913 Webster]

         Now let not nature's hand
         Keep the wild flood confined! let order die! --Shak.
   [1913 Webster]

         He is to confine himself to the compass of numbers and
         the slavery of rhyme.                    --Dryden.
   [1913 Webster]

   To be confined, to be in childbed.

   Syn: To bound; limit; restrain; imprison; immure; inclose;
        circumscribe; restrict.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

confined \confined\ adj.
   1. having movement restricted to within a certain area; --
      usually a building. Opposite of unconfined.

   Note: [Narrower terms: claustrophobic; close, confining;
         homebound, housebound, shut-in; in
         childbed(prenominal); pent, shut up(predicate);
         snowbound; weather-bound; stormbound,
         storm-bound]
         [WordNet 1.5]

   2. deprived of liberty; especially placed under arrest or
      restraint.
      [WordNet 1.5]

   3. having movement restricted to within an enclosed outdoor
      area; -- of animals.

   Syn: fenced in, penned.
        [WordNet 1.5]

   4. (Med.) not invading healthy tissue.
      [WordNet 1.5]

   5. held prisoner.

   Syn: captive, imprisoned, jailed.
        [WordNet 1.5]

   6. having movement or progress restricted to a certain area;
      as, an outbreak of the plague confined to one quarter of
      the city; wildfires confined to within the canyon.
      [PJC]

WordNet (r) 3.0 (2006):

confined
    adj 1: not invading healthy tissue [ant: invasive]
    2: not free to move about [ant: unconfined]
    3: being in captivity [syn: captive, confined, imprisoned,
       jailed]

Moby Thesaurus II by Grady Ward, 1.0:

113 Moby Thesaurus words for "confined":
   angustifoliate, angustirostrate, angustisellate, angustiseptal,
   authoritative, barred, bedfast, bedridden, beleaguered, beset,
   besieged, blockaded, bound, bounded, boxed in, cabined, caged,
   circumscribed, cloistered, close, close-fitting, closed-in,
   conditioned, constricted, cooped, copyrighted, cordoned,
   cordoned off, corralled, cramp, cramped, cribbed, crowded,
   detained, disciplined, down, enclosed, expert, feature, featured,
   fenced, finite, geographically limited, hedged, hedged about,
   hedged in, hemmed, hemmed in, hospitalized, icebound, immured,
   impounded, imprisoned, in childbed, in confinement, in hospital,
   incapacious, incarcerated, incommodious, insular, invalided,
   isthmian, isthmic, jailed, kept in, knowledgeable, laid up,
   landlocked, leaguered, limited, local, localized, meager, mewed,
   moderated, narrow, near, of a place, paled, parochial, patented,
   penned, pent, pent-up, prescribed, proscribed, prostrate,
   provincial, qualified, quarantined, railed, restrained, restricted,
   scant, scanty, shut-in, sick abed, slender, snowbound, specialist,
   specialistic, specialized, stinted, strait, straitened, technical,
   tight, topical, under restraint, vernacular, walled, walled-in,
   windbound