1. Difficult to analyse or understand
   "a complicated problem"; "complicated Middle East politics";
   - complex

1. Make more complicated
   "There was a new development that complicated the matter";
   - perplex
    
2. Make more complex, intricate, or rich
   "complicate a design or pattern";
   - refine, rarify [rare], elaborate, rarefy

See also: complex

Type of: alter, change, modify

Antonym: simplify

Encyclopedia: Complicated