资料来源 : Webster's Revised Unabridged Dictionary (1913)

Lightsome \Light"some\ (l[imac]t"s[u^]m), a.
   1. Having light; lighted; not dark or gloomy; bright.

            White walls make rooms more lightsome than black.
                                                  --Bacon.

   2. Gay; airy; cheering; exhilarating.

            That lightsome affection of joy.      --Hooker.
      -- {Light"some*ly}, adv. -- {Light"some*ness}, n.

            Happiness may walk soberly in dark attire, as well
            as dance lightsomely in a gala dress. --Hawthorne.

资料来源 : WordNet®

lightsomeness
     n 1: the cheerful feeling you have when nothing is troubling you
          [syn: {carefreeness}, {insouciance}, {lightheartedness}]
     2: the gracefulness of a person or animal that is quick and
        nimble [syn: {agility}, {legerity}, {lightness}, {nimbleness}]
     3: the trait of being lighthearted and frivolous