in English is:

antidote

Mutations

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

Use

y gwrthwenwyn hwn
fy ngwrthwenwyn i
dy wrthwenwyn di
ei wrthwenwyn ef/o
ei gwrthwenwyn hi
ein gwrthwenwyn ni
eich gwrthwenwyn chi
eu gwrthwenwyn nhw/hwy
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