This is the 435th most frequent Serbian word.
добре
"Добре" in English means "well" or "good."
In this sentence, 'добре' is the plural form of the adjective 'добар' (good) used to describe a plural feminine noun, showing agreement in gender, number, and case.
Они су добре људе.
They are good people.
Here, 'добре' is an adverb meaning 'well,' used to modify the verb 'слушам' (am listening).
Добре вас слушам.
I am listening to you well.
In this construction, 'добре' acts as part of a fixed phrase 'добре је' meaning 'It is good,' used impersonally to express a general state or observation.