Here are several synonyms for "serious," grouped by common meanings:
General Synonyms- Critical- Grave- Important- Meaningful- Momentous-
Profound- Severe- Significant- Substantial- Thoughtful- Weighty
Synonyms for "Serious" as Grave or Severe- Acute- Alarming- Bad-
Dangerous- Extreme- Grievous- Worrying
Synonyms for "Serious" as Important or Significant- Deep- Difficult- Far-
reaching- Fateful- Grim- Major- Pressing- Urgent
Synonyms for "Serious" as Thoughtful or Reflective- Careful- Detailed-
In-depth- Meditative- Pensive- Reflective
Other Common Synonyms- Earnest- Sedate- Sober- Solemn- Staid- Stern-
Unhumorous- Unsmiling
These synonyms can be used depending on the context—whether you mean something is important, grave, thoughtful, or solemn.
