This is the 319th most frequent Portuguese word.
difícil
Difficult; hard.
In this case, 'difícil' describes the level of challenge of the math exam, associating with a task or situation being hard to accomplish.
O exame de matemática foi muito difícil.
The math exam was very difficult.
In this statement, 'difícil' refers to the complexity involved in expressing intricate emotions in a brief manner.
É difícil explicar sentimentos complexos com poucas palavras.
It is difficult to explain complex feelings with a few words.
Here, 'difícil' conveys the challenge associated with the process of acquiring a new skill, indicating an abstract difficulty.