твердий in English:

Study hard.

A pick is a long handled tool used for breaking up hard ground surfaces.

The hard rain spoiled our hike through the woods.

Mary has a bad back. It's hard for her to lift things.

I'm sure it wouldn't be too hard to find another place to live.

He's somewhat hard of hearing, so please speak louder.

It is hard for an old man to change his way of thinking.

His success is attributed more to hard work than to genius.

Whether you succeed or not depends on how hard you study.

A chance to do as we please, especially to do as little hard work as possible, is a secret desire of almost everybody.

Please don't boil the eggs so hard.

Many people in these parts have fallen on hard times.

Just staying alive in these times is hard enough.

My heart is pounding so hard it feels like it's going to explode.

The reason for your failure is that you did not try hard enough.

Ice is solid.

The process by which substances are turned directly from a solid state into a gas is called sublimation.

The bureaucrats maintain solid ties with the gigantic corporations.

He had established a solid reputation as a man of character.

The sea ice is highly variable - frozen solid during cold, calm weather and broken up in large areas of open water during storms.

Globalization has gone mad: why transport Spanish cucumbers to exterminate the Northern Germans when half of them live in Mallorca? We need to rationalize all of that and adopt a more solid method of bacterial decontamination.

Cheese is a solid food made from the milk of cows, goats, sheep, and other mammals.

solid three days/ solid partnership/ solid pices

solid rock

it works by building up layer upon layer of material to make solid objects

In the old days people used to build solid comfortable houses.

Banks are usually solid buildings, so that their strength reassures customers.

It took me two solid months to finish that job.

As yet, they have no solid evidence.

Can you do me a solid?