pei'o UI4 experimental cmavo

attitudinal category question: what is the category (UI4) of attitudinal?

Specifically asks about the UI4-category, either when attached to attitudinals or used alone. Valid answers include both the category on its own and a whole UI with additional specifiers (as long as the category is included). Of course, any relevant -nai or -cu'i of the category must be included in the answer.