in English is:

obsolescence

Mutations

Soft:ddarfodiad
Nasal:narfodiad
Aspirate:(no mutation)

Use

y darfodiad hwn
fy narfodiad i
dy ddarfodiad di
ei ddarfodiad ef/o
ei darfodiad hi
ein darfodiad ni
eich darfodiad chi
eu darfodiad nhw/hwy
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