Jul 14, 2026 · serious, grave, solemn, sedate, staid, sober, earnest mean not light or frivolous. serious implies a concern for what really matters.

2 days ago · Some common synonyms of serious are earnest, grave, sedate, sober, solemn, and staid. While all these words mean "not light or frivolous," serious implies a concern for what really matters.

Please don't laugh - I'm being serious. He was wearing a very serious expression and I knew something was wrong. On the surface it's a very funny novel but it does have a more serious underlying theme.

Find 173 different ways to say SERIOUS, along with antonyms, related words, and example sentences at Thesaurus.com.

1. of, showing, or characterized by deep thought. 2. grave or somber, as in character, disposition, or mood.

SERIOUS definition: of, showing, or characterized by deep thought. See examples of serious used in a sentence.

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Any important situation is serious, and this word is also the opposite of humorous and playful.

Please don't laugh - I'm being serious. He was wearing a very serious expression and I knew something was wrong. On the surface it's a very funny novel but it does have a more serious underlying theme.

Learn the meaning and correct usage of "serious". Our guide provides clear grammar rules and real-world examples from authoritative sources to help you write with confidence.