ribuaka

Bingham: Hiram Bingham, A Gilbertese-English Dictionary (1908, 1953). American Board of Commissioners for Foreign Missions.
Sabatier: Ernest Sabatier, M.S.C., Dictionnaire Gilbertin-Français (1954), translated by Sr. M. Oliva as Gilbertese-English Dictionary (1971). South Pacific Commission Publications Bureau.

Bingham

ríbuaka

a. unjust, unkind, unaccomodating.

n. unjustness, unkindness, unwillingness to accommodate.

ribuaka

n. bad behaviour, vile conduct.

a. ungrateful, unjust, disobliging, wicked, bad-mannered.

vc. ka-ribuaka...: to make..., to accuse of...