foolishly    (to act) kwīfūtanya, gusaragurika
(to act ~ in fun) kudāyāngwa, gupfyina
(to speak ~) kudebagura, gusaragurika
En-En dictionary 
act    (to ~ as go-between) kurehereza
(~ as if to beat, but not do it) kugera
(~ foolishly) kwītūtānya, gusaragurika, kudāyāngwa
(~ foolishly in fun) gupfyina
(~ homosexually) gutingana
(~ ignorantly) kwītūtānya
(~ indifferent) kwīrengagiza
(to ~ or go secretly because of fear) kwōmba
En-En dictionary 
gusaragurika (-saraguritse)   v    1. to talk or act foolishly, as a crazy person, 2. to ferment quickly, 3. to reject counsel, 4. to be marked, scratched (as cooking pot with design), 5. to burst open in garden (as overripe beans)
kudebagura (-debaguye)     v    1. to speak foolishly, 2. to be unintelligent, 3. to be ignorant (used in NT for barbarous)
kwīfūtānya (-īfūtānye)     v    1. to revert, go backward, 2. get thinner, 3. to act foolishly, ignorantly
kwītūtānya (-ītūtānye)   v    to act foolishly, to act ignorantly
speak    (speaking evil of another with whom you work) ikēba
(one who speaks with senseless repititions of words) ikirogorogo
(all speaking together) imvugarimwe
(to ~) kuvuga
(against) guhāririza
(carelessly) gufudika
(clearly) gufobōra, gutobekeranya
(distinctly) gutobora
(distinctly, not having been able to before) gutumbūra
(evil of one another) gucurikanya
(evil of) gukana, kunegura
(evil of the king) kurogota
(evil of a ruler) kuyoba
(fearlessly) kwūbahuka
(foolishly) kudebagura
(hatefully) gucobogoza
(hesitantlyusually used in negative) guhengēshanya
(in a mysterious language) gufobeka
(incoherently) kuvōvōta
(in someone's favor) gutēturura
(lightly) kujajura
(loudly) kurangurura, kurandamuka
(many words, usually quite meaningless ones) guhogōmboka
(sarcastically) kurtyekeza
(the truth) guhinyuza
(thoughtlessly) kurandamuka
(unwisely or rudely) kurofokwa
(very beseechingly) kubobōteza
(when one shouldn't) kuyogora
(where others hear voices but do not understand) guhwirima
(without arriving at point) kurerembuza
(to cause to) kuvuza
(to leave off speaking evil and speak kindly) kwigarura
(to prevent from speaking) guhwāmika
(give gift to bride so she will ~) guhorōra
(refuse to speak till given gift, as bride does) guhorōrwa
En-En dictionary 
talk    kuyāga, gusakuza, kugānīra
(foolishly, or act) gusaragurika
(give discourse) kugamba
(in one's sleep) kurāzirana
(lightly) kujajura
(loudly) guhogora
(a lot) kuregeteza
(nonsense when drunk) kuvōvōta
(over) gutegēranya
(slanderously) kuvōvōta
(together in whispers) kunwengurana, kwītōnganya
(to oneself) kwītonganya
(unkindly to each other) kurandagurana
(when one shouldn't) kuyogora
(with someone to try to persuade her to elope) gucīkiza
(to sit together talking for a long time) gutūrika
(one who talks a lot, esp. tells others what to do) ingāre
En-En dictionary