Obedient

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Middle English: via Old French from Latin oboedient- ‘obeying’, from the verb oboedire (see obey).

wiktionary

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From Middle English obedient, from Old French obedient, from Latin oboediēns, present active participle of oboediō(“obey”).

etymonline

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obedient (adj.)

c. 1200, "willing to serve (someone); willing to fulfill an obligation," from Old French obedient "obedient" (11c.), from Latin oboedientem (nominative oboediens) "obedient, compliant," present participle of oboedire "to obey" (see obey).