This is the 1326th most frequent Spanish word.
siente
"Feels" or "sit down" (depending on context).
The word 'siente' is used as a verb conjugated in the present tense for the third-person singular. It means 'feels' and describes an emotional state of the subject.
Él siente felicidad cuando está con su familia.
He feels happiness when he is with his family.
Here, 'se siente' is a reflexive verb form, indicating that the subject is experiencing a state of being—feeling safe—in her environment.
Ella siempre se siente segura en su hogar.
She always feels safe in her home.
In this sentence, 'siente' is used to express a sensation or feeling—curiosity—towards the action mentioned, reflecting his interest.