IPA: //əˈtɛntɪv//
KK: /əˈtɛntɪv/
Showing careful attention and consideration to someone or something; being watchful and mindful of details.
The teacher was very attentive to her students' needs during the lesson.
Attentive is formed from "attendere" (meaning to stretch toward) and the suffix "-ive" (meaning having the quality of). The word describes someone who has the quality of stretching their focus toward something, indicating careful observation or consideration.
Think of someone who is 'stretching' their attention toward something — that's why attentive means being focused and observant.