The Collaborative International Dictionary of English v.0.48:

disconnected \disconnected\ adj.
   1. marked by or composed of disconnected parts or sounds.
      [Narrower terms: staccato (vs. legato)]

   Syn: abrupt, broken off(predicate).
        [WordNet 1.5]

   2. not switched on or not connected to a power source; -- of
      electrical equipment. [Narrower terms: off-line (vs.
      on-line), offline, off line(predicate); unplugged]

   Syn: not ready, off.
        [WordNet 1.5 +PJC]

   3. noncontinuous; not continuing in time or space. Opposite
      of continuous.

   Syn: disrupted, discontinuous.
        [WordNet 1.5 +PJC]

   4. unconnected, detached. Opposite of connected.

   Syn: disjoined, separate.
        [WordNet 1.5]

   5. lacking orderly continuity; illogical or seemingly
      irrational; as, disconnected fragments of a story.

   Syn: confused, disjointed, disordered, disorganized,
        desultory, garbled, illogical, rambling, scattered,
        unconnected.
        [WordNet 1.5]