The Collaborative International Dictionary of English v.0.48:

concentrated \concentrated\ adj.
   1. Having a high density of (the indicated substance); as, a
      narrow thread of concentrated ore.

   Note: [Narrower terms: undiluted (vs. diluted)]
         [WordNet 1.5]

   2. Gathered together or made less diffuse; as, their
      concentrated efforts; his concentrated attention. Opposite
      of distributed or diffused.

   Note: [Narrower terms: bunched, bunchy, clustered;
         centered, centred, centralized, focused;
         undivided] [Also See: compact.]
         [WordNet 1.5]

   3. Intense; in an extreme degree; -- of mental phenomena; as,
      her concentrated passion held them at bay.
      [WordNet 1.5]

   4. being the most concentrated solution possible at a given
      temperature; unable to dissolve still more of a substance.
      Opposite of dilute or unsaturated.

   Note: [Narrower terms: supersaturated]

   Syn: saturated.
        [WordNet 1.5]

   5. reduced to a stronger or more concentrated form; as,
      concentrated sulfuric acid. Opposite of diluted.

   Syn: condensed.
        [WordNet 1.5]

   6. characterized by intensity; especially when imposed from
      without; -- of actions; as, concentrated study.

   Syn: intensive.
        [WordNet 1.5]

   7. characterized by mental concentration.

   Syn: intent.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

supersaturated
    adj 1: being more concentrated than normally possible and
           therefore not in equilibrium

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "supersaturated":
   allayed, bloated, bursting, choked, cloyed, congested, crammed,
   crowded, disgusted, distended, drenched, engorged, fed-up,
   filled to overflowing, full, full of, glutted, gorged, hyperemic,
   in spate, jaded, jam-packed, jammed, overblown, overburdened,
   overcharged, overfed, overflowing, overfraught, overfreighted,
   overfull, overgorged, overladen, overloaded, oversaturated,
   overstocked, overstuffed, oversupplied, overweighted, packed,
   plethoric, ready to burst, replete, running over, sated, satiated,
   satisfied, saturated, sick of, slaked, soaked, stuffed, stuffed up,
   supercharged, surcharged, surfeited, swollen, tired of,
   with a bellyful, with a snootful, with enough of