backwards    (to go) kwīfūtānya
(inadvertently) gufutānya
(walk) kugēndēsha umugōngo, kugēnda umugōngo
En-En dictionary 
gufūtāna (-fūtānye)     v    1. to be wicked, 2. to have bad habits (after having been good), 3. deteriorate, 4. to go backwards in possessions or habits
gufutānya (-futānije)     v    1. to grow thinner, 2. go backwards inadvertently