This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

v. Third-person singular simple present indicative form of nullify.

"But Mr. Hobbes counters that a clause in the contract that guarantees the OPP will be the province's highest paid force at the end of the three-year term nullifies the effect of the last two years."

create   

nullified    nullifies    nullifying   

negate    contradict    weaken   

invalidate    annihilate    destroy    counteract   

nullified   

revoke    repeal    abrogate    cancel    annul