adjective
attentive
uh-TEN-tiv/əˈtentɪv/
Carefully noticing and responding to what is happening.
The attentive nurse listens closely to the older patient.

Etymology
The image of stretching the mind toward something underlies being heedful or observant. Applied to another person's needs, attentive also came to describe actively caring for those needs.
In context
Beside it stands its mother, tall and attentive. She is browsing but never takes her eyes off her calf.
More examples
- An attentive host notices when a guest needs help.
- The audience remained attentive throughout the long presentation.
- She is attentive to small changes in her patients' condition.
Forms
attentively adverb — With careful attention to what is happening.
Similar words
- observant
- Emphasizes noticing details rather than responding to others' needs.
- considerate
- Emphasizes concern for other people rather than careful observation.