Wordnet 3.0
ADJECTIVE (1)
1. 
 extremely dark; 
- Example: "a black moonless night"- Example: "through the pitch-black woods"- Example: "it was pitch-dark in the cellar"[syn: black, pitch-black, pitch-dark]
The Collaborative International Dictionary of English v.0.48:
Pitch-dark \Pitch"-dark`\, a.
   Dark as a pitch; pitch-black.
   [1913 Webster]
WordNet (r) 3.0 (2006):
pitch-dark
    adj 1: extremely dark; "a black moonless night"; "through the
           pitch-black woods"; "it was pitch-dark in the cellar"
           [syn: black, pitch-black, pitch-dark]