desconhecido v angličtině:

A discussion moving into uncharted territory

Parts of the ocean floor remain uncharted and many new discoveries can be expected there.

These are definitely uncharted waters and but I think if the United States is going to find any future for NATO, it has to look at it in ways beyond traditional military missions.

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

I'm a stranger here.

Why shouldn't truth be stranger than fiction? Fiction, after all, has to make sense.

A stranger asked the girl whether her father was at home or at his office.

There is a tendency for Japanese to want to know a certain amount of personal information about someone such as age, position and whether they are married or not, before they feel comfortable talking with a stranger.

I asked him to come with me, for I was a stranger in that part of the city.

Just before the wedding, the drunken father shouted at the groom: "I won't hand out my daughter to some stranger!"

My therapist told me to go to a bar and strike up a conversation with a complete stranger.

If a stranger on the street slapped me in the face, I'd kill him without warning.

You hear about a lot of incidents these days that would be hard to dream up. It really backs up the old saying that fact is stranger than fiction.

So. Having had all that done to him it would be stranger if he wasn't enraged.

A stranger tapped me on the shoulder from behind. He must have mistaken me for someone else.

I had an interesting talk with a stranger on the train to London.

Like other novelists, Walter Streeter was used to getting communications from strangers

He was a complete stranger to me. (On był dla mnie kompletnie obcy.) She doesn't let her children talk to strangers. (Ona nie pozwala swoim dzieciom rozmawiać z nieznajomymi.)

My friend is a great guy but he is so shy. You can't imagine how difficult it is for him to start a conversation with a stranger.