Etymology
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deceptive (adj.)

"tending to mislead or give false impression," 1610s, from French deceptif (late 14c.), from Medieval Latin deceptivus, from decept-, past participle stem of Latin decipere "to ensnare, take in, beguile, cheat," from de "from" or pejorative (see de-) + capere "to take," from PIE root *kap- "to grasp."

In this sense in English it superseded deceptious (c. 1600), from French deceptieux, from Medieval Latin deceptiosus, from deceptionem; also deceptory (mid-15c.), from Latin deceptorious. Related: Deceptively; deceptiveness.

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Definitions of deceptive

deceptive (adj.)
causing one to believe what is not true or fail to believe what is true;
deceptive calm
Synonyms: delusory
deceptive (adj.)
designed to deceive or mislead either deliberately or inadvertently;
the deceptive calm in the eye of the storm
deliberately deceptive packaging
Synonyms: misleading
From wordnet.princeton.edu