nullify

动词 nullify:

1. declare invalid
   同义词：invalidate, annul, quash, void, avoid
2. show to be invalid
   同义词：invalidate
3. make ineffective by counterbalancing the effect of
   同义词：neutralize, neutralise, negate

1. The state of being nullified.
   取消被取消的状态
2. How can we nullify the enemy's propaganda?
   怎样才能抵销敌人的宣传?

nul.li.fy

v.tr.（及物动词）
nul.li.fied,nul.li.fy.ing,nul.li.fies
To make null; invalidate.
使无效；废除
To counteract the force or effectiveness of.See Synonyms at neutralize
抵消：使…的力量或影响相互作用参见 neutralize

来源：
Latin nôllific3re [to despise]
拉丁语 nôllific3re [轻视]
nôllus [none] * see ne
nôllus [没有人] *参见 ne
-fic3re [-fy]
-fic3re [使]