Source : 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.

Source : WordNet®

lightsome
     adj 1: moving easily and quickly; nimble; "the dancer was light and
            graceful"; "a lightsome buoyant step"; "walked with a
            light tripping step" [syn: {light}, {tripping}]
     2: carefree and happy and lighthearted; "was loved for her
        blithe spirit"; "a merry blithesome nature"; "her
        lighthearted nature"; "trilling songs with a lightsome
        heart" [syn: {blithe}, {blithesome}, {lighthearted}]