in English is:

vitalism

Mutations

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

Use

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