in English is:

simony

Mutations

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

Use

y seimoniaeth hon
fy seimoniaeth i
dy seimoniaeth di
ei seimoniaeth ef/o
ei seimoniaeth hi
ein seimoniaeth ni
eich seimoniaeth chi
eu seimoniaeth nhw/hwy
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