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]

The Collaborative International Dictionary of English v.0.48:

Snow-bound \Snow"-bound`\, a.
   Enveloped in, or confined by, snow. --Whittier.
   [1913 Webster]

WordNet (r) 3.0 (2006):

snowbound
    adj 1: confined or shut in by heavy snow