sadness    akabōnge, umubabaro, intimba
En-En dictionary 
akabōnge     7  class 7
singular: aka-,aga-
  
(no pl.) 1. sadness, sorrow, 2. vacation, 3. depression
intimba (in-)     3  class 3
singular: i-,in-
plural: i-,in-
  
1. sadness, 2. sorrow, 3. grief
gucurira intimba to sing (or play) sad song