This is the 11395th most frequent Spanish word.
estudioso
Studious; someone who studies a lot or has a strong interest in learning.
Here, 'estudioso' functions as an adjective to describe Carlos as someone who dedicates significant effort to studying and learning.
Carlos es muy estudioso y siempre está leyendo libros.
Carlos is very studious and is always reading books.
In this sentence, 'estudioso' serves as a noun referring to a person who studies or researches a particular field intensively, in this case, ancient history.
Soy un estudioso de la historia antigua.
I am a scholar of ancient history.
Here, 'estudiosa' (feminine form), modifying 'actitud,' emphasizes a characteristic associated with being diligent and focused on study-related activities.