In probability theory, an impossible event contains no possible outcomes and therefore cannot occur.

She spent her life chasing impossible dreams while helping others find their courage.

The museum's display featured a collection of impossible bottles that captivated everyone.

At the antiques fair, she proudly displayed an impossible bottle that contained a tiny ship which clearly could not have fit through its narrow neck.

The team signed up for several missions impossible, each more dangerous than the last.

Despite the skepticism of his colleagues, he treated those cases as true mission impossibles and tackled them one by one.

After years of setbacks, she finally accepted that her impossible dream of building a flying car was just wishful thinking.

He labeled their plan the impossiblest idea he'd ever heard, but he still couldn't stop them.