сложный in inglese:

It's too difficult.

It may seem like a minor thing to you, but for a lot of people this is really difficult to do.

Last night was very hot and muggy and it was difficult to sleep.

After a certain point, everything became a little more difficult.

It is difficult to love somebody when it's not clear whether or not the other person loves you the same way.

A good password should be difficult to guess, but easy to remember.

I agree with the ban in principle, but in practice it will be extremely difficult.

Anyway, I'm glad you were able to broach this difficult subject.

It's not as difficult to find a native speaker to help you with your language studies as it used to be.

Getting food to Fort Sumter would be a very difficult job.

A person who makes an easy matter sound difficult does not seem to be so smart.

Cutting a cake into equal pieces is rather difficult.

We're studying chemistry. Our lessons aren't difficult.

He just naturally avoids everything that is intense, difficult or strenuous.

In legal documents, difficult words and phrases are often used.

This complex situation arose because signals from the environment itself can be inadequate.

How complex?

There are so-called primitive cultures in the jungles of the Amazon and on the island of New Guinea, and there are so-called advanced cultures in Europe, Asia, and Africa, but the languages of these cultures are all equally advanced and complex.

Those four words carried not only a lot of complex information, but also the persuasive force of a proverb.

In China, there is a large number of characters, so the goal of the character simplification was to replace the complex traditional characters with easy to remember simplified characters and increase the literacy rate.

All of his friends were body pillows, and all of hers were dolls; so they bonded over their fondness for animating the inanimate. However, because they were not inanimate objects but people with complex emotions, their relationship was sometimes strained.

This might lead us to believe that a simple culture would make use of a simple language, that a complex culture would make use of a complex language, and so on.

Courses in analysis begin with the fundamental notions of mathematical logic, important proof techniques, and the construction of real and complex numbers.

When we say that a language is culturally transmitted - that is, that it is learned rather than inherited - we mean that it is part of that whole complex of learned and shared behavior that anthropologists call culture.

These quotations were effective in sending complex messages to his friends, because, in his day, people could quote from such authors with every expectation of being understood.

The real, biological nervous system is highly complex and includes some features that may seem superfluous based on an understanding of artificial networks.

Plant growth and productivity react sharply to a complex combination of temperature and moisture.

No single speech can eradicate years of mistrust, nor can I answer in the time that I have all the complex questions that brought us to this point.

This problem is quite complex, you have to help me. (Ten problem jest dość złożony, musisz mi pomóc.) She solved a very complex mathematical equation. (Ona rozwiązała bardzo skomplikowane matematyczne równanie.)

But as civilizations grew more complex, better methods of communication were needed.