The phrase "disprove him" is correct and usable in written English.
You can use it when you want to argue against someone's statement or opinion in a formal context. For example: "My colleague argued that the company was in financial trouble, but I was able to disprove him with the facts I brought to the meeting."
Today the lawyer added that allegations of insider trading are so essential to the indictment that the government's refusal to prove them thus letting him disprove them was so fundamental there should be a mistrial.
Ignore put downs or disprove them.
Under English law, bin Mahfouz has never had to appear in open court to disprove the accusations against him.
It would be just like him to disprove such an assertion though he has looked extremely tired of late and prone to mistakes.
James E. McGreevey, the Democratic candidate and Woodbridge's mayor, said Mr. DiFrancesco was obliged to "disprove" the allegations against him, "not merely to state that they are not true".
The 65-year-old anchor – who earlier dismissed the Mother Jones article as "total bullshit", "disgusting", "defamation" and "a piece of garbage" – had promised that the archive tapes would comprehensively disprove the charges against him.
The hearings stopped in 1999 after a military coup brought Gen. Pervez Musharraf to power but were revived in January at the instigation of Justice Chaudhry, who is eager to disprove critics who accuse him of going soft on the powerful army.
His tactics were as uninspiring as his public utterances, his selections seemed muddled and some of his major decisions, such as awarding Wayne Rooney a new contract or signing Juan Mata, seemed designed to disprove popular perceptions of him rather than to advance the team.
Grossman and Favre traded interceptions after that, but Grossman was doing little to disprove the Bears' faith in him.
