in English is:

perfectionism

Mutations

Soft:berffeithiaeth
Nasal:mherffeithiaeth
Aspirate:pherffeithiaeth

Use

y berffeithiaeth hon
fy mherffeithiaeth i
dy berffeithiaeth di
ei berffeithiaeth ef/o
ei pherffeithiaeth hi
ein perffeithiaeth ni
eich perffeithiaeth chi
eu perffeithiaeth nhw/hwy
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