

Этот свитер слишком тонкий для зимы.
This sweater is too thin for winter.
Осторожно, здесь очень тонкий лёд!
Careful, the ice is very thin here!
Хочешь тонкий кусок сыра?
Do you want a thin slice of cheese?
"тонкий" is in the lesson "Adjectives 3" (Level 7), along with 13 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.