inkūmbu (in-)     3  class 3
singular: i-,in-
plural: i-,in-
  
lonesomeness
urukumbuzi (in-  6  class 6
singular: uru-
plural: in-
  
nostalgia, homesickness
loneliness    irungu, inkūmbu
En-En dictionary 
lonesomeness    inkūmbu, irungu
En-En dictionary 
 inkumbu found in: Kirundi II (Grammar)
chapter 51   Nouns made from Verbs