đừng vô lý 
don’t be silly, don’t be stupid [ đừng ] : do not, let us not, don’t
[ vô ] : (1) in-, im-, (negative prefix); (2) in, at, on; (3) to go into, enter [= vào]
[ lý ] : physics; reason, principle, law
Most Common Compounds Set 1:
Most Common Compounds Set 2 :