The comparative form of “serious” is “more serious”.
In English, adjectives with three or more syllables typically form their comparative by adding “more” before the adjective, rather than adding “-er” to the end. For example:
- Serious → More Serious (comparative)
- Serious → Most Serious (superlative)
Example Sentences:
- This is a serious issue.
- The second accident was more serious than the first.
- Among all the cases, this is the most serious one.
The word “serious” does not take the -er suffix, as it doesn’t fit the typical pattern for shorter adjectives. Using “more” maintains clarity and correctness.