

Этот хлеб совсем твёрдый, он вчерашний.
This bread is really hard; it's from yesterday.
Подожди пару дней, груши ещё твёрдые.
Wait a couple of days; the pears are still hard.
Врач посоветовал спать на твёрдом матрасе.
The doctor advised sleeping on a firm mattress.
"твёрдый" is in the lesson "Properties" (Level 26), along with 9 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.