un

There are UN-backed initiatives to improve the efficiency of AC, so it uses less power and produces fewer pollutants.

We use the prefix 'un-' with the adjective 'detected' to make 'undetected', which means the opposite - you can't find it.

At an emergency meeting of the UN Security Council, many countries criticised the actions of the US, saying they broke international law.

That's according to the UN.

In 2015, scientists at the Center were examining sweet potato DNA sequences, when they stumbled upon some genes that were distinctly un-potato-like— genes from Agrobacterium!

This speech This speech was an important opportunity for Trump tonight because right now his popularity is un- According to a recent CNN poll, his job approval rating among all adults is at 36%.

Its first line is so iconic, many Mexicans know it by heart: “Vine a Comala porque me dijeron que acá vivía mi padre, un tal Pedro Páramo.”