in English is:

counterstroke

Mutations

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

Use

yr wrthergyd hon
fy ngwrthergyd i
dy wrthergyd di
ei wrthergyd ef/o
ei gwrthergyd hi
ein gwrthergyd ni
eich gwrthergyd chi
eu gwrthergyd nhw/hwy

or

y gwrthergyd hwn
fy ngwrthergyd i
dy wrthergyd di
ei wrthergyd ef/o
ei gwrthergyd hi
ein gwrthergyd ni
eich gwrthergyd chi
eu gwrthergyd nhw/hwy
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