

Сегодня был трудный день.
Today was a hard day.
Завтра у меня трудный экзамен.
I have a difficult exam tomorrow.
Это не такой трудный вопрос.
It's not such a difficult question.
"трудный" is in the lesson "Adjectives 6" (Level 40), along with 10 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.