in English is:

astuteness

,

insight

,

shrillness

Mutations

Soft:dreiddgarwch
Nasal:nhreiddgarwch
Aspirate:threiddgarwch

Use

y treiddgarwch hwn
fy nhreiddgarwch i
dy dreiddgarwch di
ei dreiddgarwch ef/o
ei threiddgarwch hi
ein treiddgarwch ni
eich treiddgarwch chi
eu treiddgarwch nhw/hwy
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