This is the 13983rd most frequent Spanish word.
sufres
"You suffer."
Here, 'sufres' conveys a general experience of distress or hardship in response to not being prepared.
Cuando no estudias, sufres al hacer el examen.
When you don't study, you suffer while taking the exam.
In this sentence, 'sufres' indicates emotional pain stemming from interpersonal interactions.
Si alguien te lastima, sufres emocionalmente.
If someone hurts you, you suffer emotionally.
This usage of 'sufres' refers to a physiological response to a negative event.