1610s, from French deceptif (late 14c.), from Medieval Latin deceptivus, from decept-, past participle stem of Latin decipere (see deceive). Earlier in this sense was deceptious (c. 1600), from French deceptieux, from Medieval Latin deceptiosus, from deceptionem. Related: Deceptively; deceptiveness.[deceptive etymology, deceptive origin, 英语词源]