in English is:

fusibility

Mutations

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

Use

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