反义词:frivolous;playful
副词:seriously;名词:seriousness
同义词:dangerous,grave,grievous,life-threatening,severe;good;sober,unplayful
造句:1.John smiled at them and gave Richard a playful poke.
2.This album is bright, breezy and playful.
3.This is a frivolous way of attacking theproblem.
4.I just decided I was a bit too frivolous to be adoctor.
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