1. superlative form of extreme; greatest in degree, intensity, or extent
Usage: archaic or literary; modern usage typically prefers 'most extreme'

Examples

• The extremest cold of winter made travel nearly impossible.
• She showed the extremest patience when dealing with difficult customers.
• That was the extremest example of poor judgment I have ever witnessed.
• The extremest measures were taken to ensure the building's safety.
• In the extremest circumstances, the team had to abandon the mission.