a.

1. 嚴重的；危急的；令人擔心的
   His error is serious.

   他的錯誤很嚴重。

2. 嚴肅的，莊嚴的
   He was kind and affectionate, but very serious.

   他仁慈、親切，但非常嚴肅。

3. 認真的；不是開玩笑的；當真的[（+about/in）]
   I was pretty serious in what I said at dinner.

   我晚餐時說的話是當真的。

4. 重要的；須認真對待的
   Getting married is a serious matter.

   結婚是件大事。

5. （文學，音樂等）嚴肅的，非供消遣（或娛樂）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。

6. 宗教的；倫理學的
7. 熱衷的，極感興趣的[（+about）]
   He is not serious about literature.

   他對文學不感興趣。

8. 【口】大量的；過多的

adj.

1. demanding or characterized by careful consideration or application.
   ▸solemn or thoughtful.
2. sincere and in earnest, rather than joking or half-hearted.
3. significant or worrying in terms of danger or risk:
   serious injury.
4. informal substantial in terms of size, number, or quality:
   serious money.