xenru -xer-xe'u- gismu

x1 regrets/rues (abstraction) x2; x1 is regretful/rueful/sorry/[remorseful] about x2.

Also: x1 feels remorse about x2 (= zugyxe'u). (cf. cmavo list u'u, zungi)


In notes:

zungi
x1 feels guilt/remorse about x2 (abstraction).
u'u
attitudinal: repentance - lack of regret - innocence.