Light"some (?), 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.
© Webster 1913.