

Это очень опасный район.
This is a very dangerous neighborhood.
Осторожно, здесь опасный поворот!
Careful, there's a dangerous turn here!
Разве это опасный спорт?
Is that really a dangerous sport?
"опасный" is in the lesson "Adjectives 2" (Level 4), along with 17 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.