Careful, contemplative, classical, committed, acute, OK, comfortable, and ample are another word for serious. Trivial, unimportant, and superficial are the opposites of serious. On this page, find 120 synonyms for serious, parts of speech, and examples of serious sentences.
1. important
2. solemn
3. intellectual
4. in earnest
5. severe
6. quality
This is a serious problem.
She has a serious injury.
He’s serious about his goals.
The situation requires serious attention.
That’s a serious commitment to make.