in English is:

conserve

Mutations

Soft:gyffrwyth
Nasal:nghyffrwyth
Aspirate:chyffrwyth

Use

y cyffrwyth hwn
fy nghyffrwyth i
dy gyffrwyth di
ei gyffrwyth ef/o
ei chyffrwyth hi
ein cyffrwyth ni
eich cyffrwyth chi
eu cyffrwyth nhw/hwy
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