Wordnet 3.0
ADJECTIVE (2)
1. 
 not made or become different; 
- Example: "the causes that produced them have remained unchanged"2. 
 remaining in an original state; 
- Example: "persisting unaltered through time"[syn: unaltered, unchanged]
The Collaborative International Dictionary of English v.0.48:
Unchanged \Unchanged\
   See changed.
WordNet (r) 3.0 (2006):
unchanged
    adj 1: not made or become different; "the causes that produced
           them have remained unchanged" [ant: changed]
    2: remaining in an original state; "persisting unaltered through
       time" [syn: unaltered, unchanged] [ant: altered]