a. 1. Having light; lighted; not dark or gloomy; bright. [ 1913 Webster ]
White walls make rooms more lightsome than black. Bacon. [ 1913 Webster ]
2. Gay; airy; cheering; exhilarating. [ 1913 Webster ]
That lightsome affection of joy. Hooker.
-- Light"some*ly, adv. -- Light"some*ness, n. [ 1913 Webster ]
Happiness may walk soberly in dark attire, as well as dance lightsomely in a gala dress. Hawthorne. [ 1913 Webster ]