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Adjective: twinkly (twinklier,twinkliest)  twing-k(u-)lee
  1. With a face showing happiness, friendliness or optimism
    "a round red twinkly Santa Claus";
    - beamish [archaic], smiling, smiley
     
  2. Shining intermittently with a sparkling light
    "twinkly stars";
    - twinkling, glimmering

Derived forms: twinkliest, twinklier

See also: bright, cheerful