believe    kwīzēra, kwīzigira, kwemera
(cause to) kwīzēza
En-En dictionary 
kwemera (-emeye)     v    1. to be willing, to agree to, 3. to admit, to acknowledge, to confess, concur, 4. to accept, 5. to approve, 6. to believe, to believe in
kwīzēza (-īzējeje)     v    to cause to believe
kwīzezwa (-īzejejwe)     v    to be made to believe
kwīzera (-īzeye)     v    1. to trust, 2. to believe, 3. to hope
kwīzigira (-īzigiye)     v    1. to believe, 2. to hope, 3. to trust in, to have confidence in, 4. to expect
slander    igitutsi
(to ~) gucōkōra, gukera, gusiba, gutuka
(a superior unintentionally, but he believes it intentional) kurengwa
(to say a lot of slanderous talk) kuvōvōta
En-En dictionary