in English is:

ease

Mutations

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

Use

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