in English is:

sustainability

Mutations

Soft:gynaliadwyedd
Nasal:nghynaliadwyedd
Aspirate:chynaliadwyedd

Use

y cynaliadwyedd hwn
fy nghynaliadwyedd i
dy gynaliadwyedd di
ei gynaliadwyedd ef/o
ei chynaliadwyedd hi
ein cynaliadwyedd ni
eich cynaliadwyedd chi
eu cynaliadwyedd nhw/hwy
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