WordWeb Online

1. (informal) small and of little importance
   "a trivial sum of money";
   - fiddling, footling, lilliputian, little, niggling, piddling, piffling, petty, picayune [N. Amer], piddly
    
2. Of little substance or significance
   "only trivial objections";
   - superficial
    
3. Concerned with trivialities
   "a trivial young woman"; "a trivial mind"

See also: frivolous, insignificant, unimportant

Encyclopedia: Trivial