Attentive

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late Middle English: from Old French attentif, -ive, from atendre ‘give one's attention to’ (see attend).

wiktionary

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From Middle English attentif, attentijf, from Old French attentif.

etymonline

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attentive (adj.)

late 14c., "heedful, observant" (implied in attentively), from Old French atentif "expectant, hopeful," from past-participle stem of Latin attendere "give heed to" (see attend). Sense of "actively ministering to the needs and wants" (of another person) is from early 16c.