In a composition, I'm trying to make a comparison between three characters who, besides other unfavorable traits, are extremely rude and grabby. Choosing synonyms for the description, I faced the problem of using comparatives and superlatives of the adjectives ill-bred and tight-fisted.
Michael Swan says that some compound adjectives, such as good-looking and well-known, have two possible comparatives and superlatives - better/best-looking/known and more/most good-looking/well-known, but he still says "some compound adjectives", and I have found no other examples.
The question is:
What about the two which trouble me? Would it be correct and natural for a native English speaker to use "the tightest-fisted of the three" or "he's even iller-bred than the two", or will the use of more/the most with the compound adjectives like these be always a safe path?