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Smallpox was unknown to Native Americans.

Although most islands in the ocean have been mapped, the ocean floor is generally unknown.

Many great thinkers who were unknown while alive became famous after death.

his parents are unknown.

The symbol "X" usually stands for an unknown quantity in mathematics.

There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns – the ones we don't know we don't know.

When I opened my eyes again, all of a sudden an unknown lady was standing right in front of me.

Sophie had been looking forward to getting another letter from the unknown sender.

A change of opinions is almost unknown in an elderly military man.

For all his genius, he is as unknown as ever.

The vast majority of high school students I know can't read an unknown word and pronounce the letters in the right order, let alone pronounce it correctly or naturally.

In other words, physical obstacles, perhaps unknown to the original surveyor and engineer, requiring alterations to be made in order to surmount them.

Look up unknown words in a dictionary

Author unknown

Which side won?

Please advise us, if possible, of a company which has developed image processing software.

Learning probably takes place in virtually every activity in which we take part.

Politics is perhaps the only profession for which no preparation is thought necessary.

The Tatoeba Project, which can be found online at tatoeba.org, is working on creating a large database of example sentences translated into many languages.

Despite the government's protection, he was the victim of an assassination attempt which killed him.

Time, which strengthens friendship, weakens love.

What is important is not which university you've graduated from but what you've learned in the university.

Unsure of which suitor she wanted to marry, the princess vacillated, saying now one, now the other.

Tom and Mary gave exactly the same answers on the test which made the teacher suspicious.

Lonely people tend to be afraid of meeting others, which ensures they will always be lonely.

A buyers' market is a market in which goods are plentiful, buyers have a wide range of choices, and prices are low.

The discrepancy between the stories of the two parties involved in the accident was so great that the authorities had a hard time deciding which side was telling the truth.

About 65% of American adults are overweight, which isn't good for their health.