in English is:

thoroughness

Mutations

Soft:drylwyredd
Nasal:nhrylwyredd
Aspirate:thrylwyredd

Use

y trylwyredd hwn
fy nhrylwyredd i
dy drylwyredd di
ei drylwyredd ef/o
ei thrylwyredd hi
ein trylwyredd ni
eich trylwyredd chi
eu trylwyredd nhw/hwy
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