1) Belittle 2) Cause to seem less serious 3) Decrease 4) Downplay 5) Dwarf 6) Lessen 7) Make small or insignificant 8) Minify 9) Minimise 10) Play down 11) Sneeze at 12) To treat slightingly 1) Belittle 2) Denigrate 3) Derogate 4) Diminish 5) Downplay 6) Minimise 7) Playdown 8) Trivialise 9) Trivialize 10) Underemphasize 11) Understate 
• (v. t.) To reduce to the smallest part or proportion possible; to reduce to a minimum.
to reduce to the smallest possible number, degree, or extent.
Synonym for minimize ... minimize ... 
Min'i·mize transitive verb [ imperfect & past participle Minimized ; present participle & verbal noun Minimizing .] To reduce to the smallest part or proportion possible; to reduce to a minimum. Bentham. 
[v] - belittle 2. [v] - make small or insignificant