imp·ish /ˈɪmpɪʃ/
  (a.)小鬼的,心地不良的,頑皮的
  imp·ish a. Having the qualities, or showing the characteristics, of an imp; naughtily or annoyingly playful; as, teasing and worrying with impish laughter.
  Syn: -- elfish, elvish, implike, mischievous, pixilated, prankish, puckish.
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  impish
       adj : naughtily or annoyingly playful; "teasing and worrying with
             impish laughter" [syn: implike, mischievous, pixilated,
              prankish, puckish]