unprecedented

Supporters say nuclear energy is becoming a viable answer to unprecedented power demand, delivering continuous, carbon-free power, even as others raise concerns about safety and the disposal of nuclear waste.

The chancellor herself made an unprecedented speech about the 'values' underpinning her budget.

This was a direct result of the growth of agriculture and industrialization, and an unprecedented growth—more of an explosion, actually—in the human population.

On Monday, he visited the scene of an explosion near Mika, south-east of Warsaw, which damaged the railway line leading to the Ukrainian border at the weekend, and called it "an unprecedented act of sabotage".

People familiar with the matter say his ascent to that position without passing a standard FBI background check was unprecedented.