It basically means a person is paying attention, listening to what you are saying, watching what you are doing, etc.
Attentive
it's more attentive in comparative and most attentive in superlative
They were an attentive audience.
Attentive is spell easy and I just did spell
The base word of attentive is "attend."
"Attentive" in Tagalog is translated as "mapagmasid" or "maingat."
listen attentive, pay attentive, understand, respond
Attentive is divided into syllables as follows: at/ten/tive
the kids were very attentive to the little boy and his friend.
characterized by or giving attention; observant; thoughtful: an attentive audience.
A thirst for knowledge and a strong determination can help be attentive in class.
Attentive