1. nullify - Adjective
2. nullify - Verb
To make void; to render invalid; to deprive of legal force or efficacy.
Source: Webster's dictionaryJust as no one is quite so stupid as to nullify biology completely, so too does no one deny some flexibility in the translation of genes into complex behaviors. Stephen Jay Gould
Unlike their Western counterparts, Africans take elections very seriously - rising up early to queue patiently in line for hours under the hot sun and cast their ballots. Any misguided attempt to nullify or steal their votes will evoke a strong reaction from them. George Ayittey
Sen. Robert Menendez's Comprehensive Immigration Reform Act of 2010 would try to nullify every single state and local law that fights illegal immigration. Congressman Luis Gutierrez's CIR ASAP Act with over 100 Democratic co-sponsors does the same thing. Russell Pearce
The contract was annulled Source: Internet
void a plea Source: Internet
Her optimism neutralizes his gloom Source: Internet