blithe (
http://definr.com/blithe)
adj 1: lacking or showing a lack of due concern; "spoke with blithe
ignorance of the true situation"
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:
blithesome,
lighthearted,
lightsome]