Unethical and illegal.
yes
To say that the Grand Canyon is nice is to understate its grandeur.
overstate
Overstate, exaggerate.
overstate, magnify
Minimize? Belittle?
Depreciate, minimize or understate.
understate, mute, tone down, subdue
Downplaying the significance of an event or emotion.
Simply to avoid taxes
In my opinion it is unethical.
The unethical child was grounded for 2 months.