1. Favouring social equality
   "a classless society";
   - egalitarian
    
2. Without social classes or class distinctions
   "They envisioned a classless society where all people were equal"
    
3. Not belonging or assignable to any particular social class
   "The researcher described the group as classless, defying traditional socioeconomic categories"
    
4. [N. Amer, informal] Lacking in refinement, good taste, or social grace
   "His classless behaviour at the formal dinner embarrassed his colleagues"

See also: democratic

Encyclopedia: Classless