1. Keen; biting; vigorously effective and articulate; severe.

… [Lorenzo] Mendoza, who is fifty-one, studied engineering at Fordham and management at M.I.T. Forbes estimates his net worth to be $1.5 billion. He rarely gives interviews, or speaks publicly, but when he does defend himself or his company he can be trenchant. After Maduro accused Polar of failing to produce enough corn flour, Mendoza publicly offered to lease from the government some of the corn-flour plants it had seized from other companies. Polar could produce far more than the state did, he said. Nobody seemed to doubt that assertion.

From the post: How Venezuela went from a wealthy South American country to a failing state
Source: Venezuela, a Failing State (