The Collaborative International Dictionary of English v.0.48:

Pitchy \Pitch"y\, a. [From 1st Pitch.]
   1. Partaking of the qualities of pitch; resembling pitch.
      [1913 Webster]

   2. Smeared with pitch.
      [1913 Webster]

   3. Black; pitch-dark; dismal. "Pitchy night." --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pitchy
    adj 1: of the blackest black; similar to the color of jet or
           coal [syn: coal-black, jet, jet-black, pitchy,
           sooty]
    2: having the characteristics of pitch or tar [syn: pitchy,
       resinous, resiny, tarry]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "pitchy":
   atramentous, beamless, black, black as coal, black as ebony,
   black as ink, black as midnight, black as night, caliginous,
   coal-black, coaly, dark, dark as night, dark as pitch, darkling,
   darksome, deep black, ebon, ebony, eclipsed, gumlike, gummous,
   gummy, ink-black, inky, jet, jetty, midnight, night-black,
   night-clad, night-cloaked, night-dark, night-enshrouded,
   night-filled, night-mantled, night-veiled, nigrous, obfuscated,
   obscure, obscured, occulted, onyx, pitch-black, pitch-dark, raven,
   raven-black, rayless, resinic, resinoid, resinous, resiny, sable,
   sloe, sloe-black, sloe-colored, starless, sunless, tar-black,
   tarry, tenebrious, tenebrose, tenebrous, unilluminated, unlighted,
   unlit