in English is:

sincerity

,

frankness

,

candour

Mutations

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

Use

y didwylledd hwn
fy nidwylledd i
dy ddidwylledd di
ei ddidwylledd ef/o
ei didwylledd hi
ein didwylledd ni
eich didwylledd chi
eu didwylledd nhw/hwy
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