This is the 9215th most frequent Portuguese word.
cansados
"Tired"
In this sentence, 'cansados' (tired) is used as an adjective to describe the state of the students as feeling fatigued.
Os alunos estavam cansados após a aula.
The students were tired after the class.
Here, 'cansados' (tired) is again an adjective, showing the condition of the friends being fatigued and influencing their decision.
Ele disse que seus amigos estavam muito cansados para sair.
He said that his friends were too tired to go out.
In this example, 'cansados' describes the state of the speakers (we), showing a state of physical or mental weariness.