Attentive (adjective)

1. Giving consideration to something; paying attention.
2. Careful to notice and consider things.

Origin:

Late middle english: from old french attentif, -ive or medieval latin attentivus, from latin attentus "attentive", past participle of attendere "to attend to".

Examples:

1. He was attentive to her needs.
2. She was attentive to the details of the project.
3. The teacher was attentive to the students' progress.
4. The doctor was attentive to the patient's condition.
5. He was attentive to the instructions while assembling the furniture.