a. 文雅的, 有礼貌的

[ adj ]
(used facetiously) refined
<adj.all>

Couth \Couth\ (k??th), imp. & p. p. of {Can}. [See {Can}, and
cf. {Uncouth}.]
Could; was able; knew or known; understood. [Obs.]

Above all other one Daniel
He loveth, for he couth well
Divine, that none other couth;
To him were all things couth,
As he had it of God's grace. --Gower.