in English is:

vandalism

Mutations

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

Use

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