in English is:

voluntarism

Mutations

Soft:wirfoddoliaeth
Nasal:ngwirfoddoliaeth
Aspirate:(no mutation)

Use

y wirfoddoliaeth hon
fy ngwirfoddoliaeth i
dy wirfoddoliaeth di
ei wirfoddoliaeth ef/o
ei gwirfoddoliaeth hi
ein gwirfoddoliaeth ni
eich gwirfoddoliaeth chi
eu gwirfoddoliaeth nhw/hwy
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