On grammatical class:

be'u
attitudinal modifier: lack/need - presence/satisfaction - satiation.
dai
attitudinal modifier: marks empathetic use of preceding attitudinal; shows another's feelings.
fu'i
attitudinal modifier: easy - difficult.
ga'i
attitudinal modifier/honorific: hauteur - equal rank - meekness; used with one of lower rank.
ju'o
attitudinal modifier: certainty - uncertainty - impossibility.
le'o
attitudinal modifier: aggressive - passive - defensive.
ri'e
attitudinal modifier: release of emotion - emotion restraint.
se'a
attitudinal modifier: self-sufficiency - dependency.
se'i
attitudinal modifier: self-oriented - other-oriented.
vu'e
attitudinal modifier: virtue - sin.
zo'o
attitudinal modifier: humorously - dully - seriously.
xo'o
attitudinal modifier: sarcastically - sincerely
zai'a
attitudinal modifier: observed emotion; preceding attitudinal is observed on listener