Noun-modifying adjectives that precede their head do not have case or number inflection.
NOM šöhn nehr 'a pretty girl'
APPR šöhn nehråk 'towars a pretty girl'
COM šöhn nehrker 'with a pretty girl'
But if a noun-modifying adjective is focused, it follows its head and agrees it in case and number.
Lühpen nehrat šöhnat.
I.love girl.PL.ACC pretty.PL.ACC
'I like pretty girls.'
As predicatives, adjectives take the essive case.
Nehrat šöhn.tan
girl.PL.NOM pretty.PL.ESS
'The girls are pretty.'
I decided to copy their idea to use cases as comparative and superlative forms. Vålkakil doesn't though have double cases, and just the directional case markers are used. One can of course also analyse them as comparative and superlative markers that are just homonymic with case markers. The predicative form of comparative/superlative doesn't however take an additional essive marker.Nachtuil in http://cbbforum.com/viewtopic.php?f=6&t=6220 wrote: equative with allative: less x than y
equative with ablative: more x than y
-ra 'Ablative' also means 'less', i.e. negative comparative
-åk 'Approximative' also means 'more', i.e. positive comparative
-ak 'Terminative' also means 'most', i.e. positive superlative
A non-fucused modifier doesn't have case/number inflection, like positives neither.
NOM šöhnak nehr 'the prettiest girl'
APPR šöhnak nehråk 'towars the prettiest girl'
COM šöhnak nehrker 'with the prettiest girl'
A focused modifier following the head doesn't either have the case inflection.
NOM nehr šöhnak 'the prettiest girl'
APPR nehråk šöhnak 'towars the prettiest girl'
COM nehrker šöhnak 'with the prettiest girl'
but they have number inflection
Lühpen nehrat šöhn.tra.
I.love girl.PL.ACC pretty.less.PL
'I like less pretty girls.'
Comparative/superlative predicatives also have number, but not case inflection.
Nehrat šöhn.tåk.
girl.PL.NOM pretty.COMP.PL
'The girls are prettier.'
šöhn is borrowed from German schön.