Definition of "testiest" []

• Superlative form of testy: most testy. (adjective)

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• "Partisan wrangling over how to reduce the federal deficit hit a new low Wednesday when President Barack Obama ended his testiest meeting with congressional leaders by declaring "enough is enough.""
• "(This week will be heavy with confirmation hearings; later this week, Eric Holder Jr. will appear in what may be the testiest hearing as he faces confirmation to be Attorney General.)"
• "The testiest exchanges were with the Judiciary Committee's ranking Republican, Jeff Sessions."