in English is:

terrorism

Mutations

Soft:derfysgaeth
Nasal:nherfysgaeth
Aspirate:therfysgaeth

Use

y derfysgaeth hon
fy nherfysgaeth i
dy derfysgaeth di
ei derfysgaeth ef/o
ei therfysgaeth hi
ein terfysgaeth ni
eich terfysgaeth chi
eu terfysgaeth nhw/hwy
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