The comparative form is "more serious"; the superlative form is "most serious".
The comparative form of busy is busier.
The comparative form of friendly is friendlier.
comparative form is cleaner superlative form is cleanest
The comparative form of "central" is "more central."
The comparative form of "clean" is "cleaner."
more serious
No, "seriousest" is not a word in standard English. The correct comparative form of "serious" is "more serious."
The comparative is "more serious". The superlative is "most serious".
serious
The comparative form of the adjective 'formal' is more formal.The superlative form is 'most formal'.
The comparative form of busy is busier.
The comparative form of dreamy is dreamier
The comparative form of friendly is friendlier.
comparative form is cleaner superlative form is cleanest
more serious, most serious
The comparative form of "central" is "more central."
The comparative form of many is more