in English is:

dereliction

,

depravity

Mutations

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

Use

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