in English is:

unsustainability

Mutations

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

Use

yr anghynaliadwyedd hwn
fy anghynaliadwyedd i
dy anghynaliadwyedd di
ei anghynaliadwyedd ef/o
ei hanghynaliadwyedd hi
ein hanghynaliadwyedd ni
eich anghynaliadwyedd chi
eu hanghynaliadwyedd nhw/hwy
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