in English is:

amateurism

Mutations

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

Use

yr amaturiaeth hon
fy amaturiaeth i
dy amaturiaeth di
ei amaturiaeth ef/o
ei hamaturiaeth hi
ein hamaturiaeth ni
eich amaturiaeth chi
eu hamaturiaeth nhw/hwy
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