BLITHESOME
blithe, blithesome, lighthearted, lightsome, light-hearted
(adjective) carefree and happy and lighthearted; “was loved for her blithe spirit”; “a merry blithesome nature”; “her lighthearted nature”; “trilling songs with a lightsome heart”
Source: WordNet® 3.1
Etymology
Adjective
blithesome (comparative more blithesome, superlative most blithesome)
Happy or spriteful; carefree.
Source: Wiktionary
Blithe"some, a.
Definition: Cheery; gay; merry.
The blithesome sounds of wassail gay. Sir W. Scott.
– Blithe"some*ly, adv.
– Blithe"some*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition