Both Uses

obsolete
in
A Connecticut Yankee in King Arthur's Court
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From time to time I dipped into old Sir Thomas Malory's enchanting book, and fed at its rich feast of prodigies and adventures, breathed in the fragrance of its obsolete names, and dreamed again.†
Chpt Pref. *

obsolete = no longer in general use because it was replaced by something better
He caught himself nodding, now, and smiled one of those pathetic, obsolete smiles of his, and said: "I find I can't go on; but come with me, I've got it all written out, and you can read it if you like."†
Chpt Pref.

Definitions:

(1) (obsolete)
no longer in general use because it was replaced by something better
(2) (meaning too rare to warrant focus)