serious這個單詞的反義詞是哪個單詞

relaxed，relaxing 放鬆的

1、同義詞：dangerous，grave，grievous，life-threatening，severe，goodsober，unplayful。

2、反義詞：frivolous，playful

例句：

The mistake is not very serious.    這錯誤不太嚴重。

Getting married is a serious matter.結婚是件大事。

He is a serious boy.他是個嚴肅的孩子。

I was pretty serious in what I said at dinner.我晚餐時說的話是當真的。

The play was amusingly written， but its subject was a serious one.    劇本寫得風趣逗笑，但其主題則是嚴肅的。