This is the 5275th most frequent Spanish word.
intensamente
Intensely.
Here, 'intensamente' is used to describe the vividness of the colors' shining, emphasizing their brightness and impact.
Los colores del atardecer brillaban tan intensamente que iluminaban todo el horizonte.
The sunset's colors shone so intensely that they lit up the entire horizon.
The word 'intensamente' is used here as an adverb to describe the manner in which the painter performed the action of working—showing great effort and focus.
El pintor trabajó intensamente para terminar su obra antes de la exposición.
The painter worked intensely to finish his artwork before the exhibition.
In this context, 'intensamente' modifies the verb 'estudiaron', highlighting the diligence and concentration applied to the studying.