Emily Dickinson Lexicon

LIGHT'SOME, a. [li'tesome.]

1. Luminous; not dark; not obscure. White walls make rooms more lightsome than black. [Little used.] – Bacon. The lightsome realms of love. – Dryden. [In the latter passage, the word is elegant.]
2. Gay; airy; cheering; exhilarating. That lightsome affection of joy. – Hooker.