The comparative form of busy is busier.
The comparative form of "central" is "more central."
The comparative form of "clean" is "cleaner."
Wiser is the comparative form; wisest is the superlative.
The comparative form of friendly is friendlier.
dirtier, dirtiest
dirtier, dirtiest
tidier
dirtier
Superlative and comparative of dirty
dirtier, dirtiest
dirtier, dirtiest
The comparative form of dreamy is dreamier
The comparative form of many is more
dirtier, dirtiest
Dirtier and dirtiest
The comparative form of "softly" is "more softly."