All 3 Uses

blithe
in
A Christmas Carol, by Charles Dickens
(Edited)

So surely as they raised their voices, the old man got quite blithe and loud; and so surely as they stopped, his vigour sank again.
p. 78.9

blithe = carefree and happy
He looked so irresistibly pleasant, in a word, that three or four good-humoured fellows said, "Good morning, sir! A merry Christmas to you!" And Scrooge said often afterwards, that of all the blithe sounds he had ever heard, those were the blithest in his ears.
p. 122.1 *
And Scrooge said often afterwards, that of all the blithe sounds he had ever heard, those were the blithest in his ears.
p. 122.1

blithest = most carefree and happy

Definitions:

(1) (blithe)
carefree and happy -- often unaware of or ignoring something that should be of concern
(2) (meaning too rare to warrant focus)