Definition of "gravest" []

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

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• "The Labour party was thrown yesterday into turmoil by the open letter written by three of its leading moderates about what they termed the gravest crisis in its history."
• "The state has been the center stage of India's 44-year-old Maoist rebellion that seeks to overthrow the national government, which Prime Minister Manmohan Singh has termed the gravest threat to India's internal security."
• "It was the first time that he flexed his muscles on the international front, taking what afterward he was to call his gravest risk—the forty-eight hours that were “the most nerve-racking in my life.”"