I am not a Latin specialist, so I have to rely on Wikipedia in this, but it seems that u-declension is a category for nouns, not adjectives, which seem to never have -u- in feminine accusative singular ending; also, even a u-noun would have -um, not -us, in singular accusative.
I am not a Latin specialist, so I have to rely on Wikipedia in this, but it seems that u-declension is a category for nouns, not adjectives, which seem to never have -u- in feminine accusative singular ending; also, even a u-noun would have -um, not -us, in singular accusative.
I have no idea about Lojban.