This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or befitting an imp; mischievous.

adj. mischievous; of or befitting an imp.

adj. Having the qualities, or showing the characteristics, of an imp; naughtily or annoyingly playful.

Having the qualities or behavior of an imp; devilish.

adj. naughtily or annoyingly playful

"Only he kept mounting higher and higher, till at last his impish tormentors -- _impish_, I said -- dared follow him no farther."

playful   

elfish    elvish    implike    mischievous    pixilated    prankish    puckish    demoniac    pucklike    playful   

roguish    wry    gleeful    elfin    conspiratorial    irrepressible    devilish    mischievous    waggish    self-deprecating