DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   immutable
       adj 1: not subject or susceptible to change or variation in form
              or quality or nature; "the view of that time was that all
              species were immutable, created by God" [syn:
              immutable, changeless] [ant: changeable, mutable]