WordWeb Online

1. Unvarying in nature
   "principles of unvarying validity";
   - changeless, constant, invariant
    
2. Lacking variety
   "Was it really in the farmers' interest to leave great swathes of exposed and unvarying land?";
   - unvaried
    
3. Always the same; showing a single form or character in all occurrences
   "a street of unvarying tall white buildings";
   - uniform

See also: diverseness, diversity, invariable, multifariousness, same, single, variety