unknown

That’s an equation that incorporates educated guesses, considering that future tax rates are unknown, but the best she can do is project the current system through future years.

From MarketWatch ● Oct. 23, 2026

The whereabouts of the Salvadoran team of aviation technicians who were part of the U.N.-backed Gang Suppression Force remain unknown.

From The Wall Street Journal ● Oct. 22, 2026

“That tension creates the charged space of the unknown and the emotion.”

From Los Angeles Times ● Oct. 21, 2026

"We think the negatively charged RNA may accumulate around mitochondria and disrupt the electrical balance needed for energy production, although how it happens is unknown," Yang said.

From Science Daily ● Oct. 21, 2026

The recovery of this letter, which Booth had carelessly—perhaps on purpose?—let fall into the hands of the manhunters was obviously addressed to the actor by an unknown conspirator.

From "Chasing Lincoln's Killer" by James L. Swanson

My husband, 59, and I, 55, are planning to retire over the next few years, and this is one of the biggest unknowns I’m struggling with.

From MarketWatch ● Sep. 18, 2026

There are any number of unknowns, but one thing is clear: A majority of the justices ruled that mifepristone access should remain unchanged during litigation in the case.

From Slate ● Sep. 16, 2026

Recent warnings about the potential dangers of AI show that there are significant unknowns with such a rapid growth of a new industry.

From BBC ● Sep. 15, 2026

AI’s effect on the economy and monetary policy will depend on a wide range of unknowns concerning which sorts of firm prove most profitable, how AI affects employment, and other factors.

From The Wall Street Journal ● Aug. 28, 2026

Dangerous as they could be to me, somehow, they did not seem as threatening as the dark shadowy woods with its strange sounds, its unknowns.

From "Kindred" by Octavia Butler