n. 愉快, 快乐, 高兴

[ noun ]
a feeling facetious merriment
<noun.feeling>

Jocundity \Jo*cun"di*ty\, n. [L. jocunditas jucunditas. See
{Jocund}, and cf. {Jucundity}.]
The state or quality of being jocund; gayety; sportiveness.