a. 微笑的, 愉快的, 快活的, 赏心悦目的

[ adj ]
showing or feeling mirth or pleasure or happiness
<adj.all>
laughing children

Riant \Ri`ant"\, a. [F. riant, p. pr. of rire to laugh, L.
ridere.]
Laughing; laughable; exciting gayety; gay; merry; delightful
to the view, as a landscape.

In such cases the sublimity must be drawn from the
other sources, with a strict caution, howewer, against
anything light and riant. --Burke.