sunniness

1. It comes unbidden from a place of relative personal optimism and sunniness.
   它从个人乐观主义和活泼的个性之中不自觉地冒出来。
2. A sunniness of disposition that delighted us all
   一种使我们大家高兴的开朗的性格

noun

1. the quality of being cheerful and dispelling gloom
   1. flowers added a note of cheerfulness to the drab room

   Synonym:    cheerfulnesscheersunshine

2. lightness created by sunlight