in English is:

vandalism

Mutations

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

Use

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