Chinese grammar: Negative adjectives with "-si le"死了
We might say things in English like "you scared me to death!". One way to intensify negative adjectives is to put 死了 (sǐle) after them. To express the opposite you would use 极了.
The "Subject" part below is actually optional; you can also make your over-the-top exclamations without it.
This structure is a degree complement (called 程度补语 in Chinese).
我 饿 死了。
I'm so hungry!