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smirkish

ˈsmirkish, a. rare.
  [f. smirk a. or n.]
  Smiling, pleasant; somewhat smirky or simpering.

1674 N. Fairfax Bulk & Selv. Ep. Ded., Tickled into such a laughing briskness, and fudged up into such a smirkish liveliness. 1834 Beckford Italy II. 368 The fair Naiads, comfortably fat, and most invitingly smirkish.

Oxford English Dictionary

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