Does it apply to all disyllabic adjectives? -- No, but almost all. -- It depends on each adjective.
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Mister Micawber.Does adding prefixes change the rule?-- As for instance?Happy - happier.
Cool Breeze ago a Briton said "commoner" is a noun, not an adjective."commoner" also works as an adjective (according to Swan). This usage is rare and will probably sound wrong to many but it's still correct.
Ivanhr"commoner" also works as an adjective (according to Swan).And I use it virtually all the time. I'm the guy that keeps getting dissed for the 'noun'.