Following up on my commoner posting, I write to ask for some data. What I'm looking for is cases where person A uses an inflected adjective or adverb (comparative or superlative) and person B objects to it, saying that A should have used the periphrastic variant instead, or declaring that the variant A used is "not a word" or "not English". It's ok if you are person B, so long as you can cite the source of the material you objected to. It's also worth noting cases where someone says explicitly that they are unsure of which variant to choose.
Some things that need flagging: if person A is not a native speaker; if person A is a young child; if the original production is likely to have been a deliberate invention, intended as play or display, or to have been a quotation.
Now some information about what's in my files already. The items are listed in their base forms; some of these were collected in their comparative form, some in their superlative form, some in both. (Judgments on comparatives and superlatives aren't always parallel, by the way.)
First, two items that caught my eye, though I haven't seen them complained about or queried:
corrupt [quite a few hits for corrupter 'more corrupt', including in "corrupter-than-corrupt", where the periphrastic variant just won't do]
solemn [some recent hits; and solemner and solemnest from Emily Dickinson; also in the OED]
Plus, of course, curiouser from Alice in Wonderland:
"Curiouser and curiouser!" Cried Alice (she was so much surprised, that for the moment she quite forgot how to speak good English).
This one seems playful. It's much quoted and alluded to, for example in the frequent variant "seriouser and seriouser".
And fun, which is a complex case that I will post on later.
On to the main list.
Additions welcome. Note: I am not asking for nominations of adjectives/adverbs that someone judges to be unacceptable in their inflected forms, just of such forms that have been attested.