kuziririza (-ziririje)   v    1. to absolutely refuse, 2. to superstitiously observe certain days, 3. to observe a taboo
observe    kwītegereza, kurāba
(carefully) gukengūza, kwihwēza
(class distinctions) kuzīrōra
(to superstitiously ~ certain days) kuziririza
(a taboo) kuziririza
En-En dictionary 
refuse    kwānka, kugāmbāna, guhakana, kunana
(absolutely) guta agati, kuziririza
(esp. girl to marry a certain man) kubēnga
(strongly) gukankamira
(to acknowledge one's wrong) kudadarara
(to eat) kuzira
(to eat or drink with) kunēna
(to eat what you've always eaten) guhura
(to give) kwīma
(to give to another) kwīmana
(to give another his own) kugūnga
(to go on helping someone) guhasha
(to listen, almost as crazy) gutaragurika
(to listen to authority) kugarariza
(to obey) kugaranya
(to repay loan) guheranira
En-En dictionary 
superstition    (observing certain days) kuziririza
(pagan ~) ubuzimuzimu
En-En dictionary 
taboo    ikizira
(to be) kuzira
(to break) kurēngwa, kuzirūra, kugōka
(to observe) kuziririza
(to remove) kuzirūra
En-En dictionary