in English is:

depopulation

Mutations

Soft:ddiboblogaeth
Nasal:niboblogaeth
Aspirate:(no mutation)

Use

y ddiboblogaeth hon
fy niboblogaeth i
dy ddiboblogaeth di
ei ddiboblogaeth ef/o
ei diboblogaeth hi
ein diboblogaeth ni
eich diboblogaeth chi
eu diboblogaeth nhw/hwy
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