in English is:

objectivity

Mutations

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

Use

y gwrthrychedd hwn
fy ngwrthrychedd i
dy wrthrychedd di
ei wrthrychedd ef/o
ei gwrthrychedd hi
ein gwrthrychedd ni
eich gwrthrychedd chi
eu gwrthrychedd nhw/hwy
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