in English is:

defiance

Mutations

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

Use

yr herfeiddiad hwn
fy herfeiddiad i
dy herfeiddiad di
ei herfeiddiad ef/o
ei herfeiddiad hi
ein herfeiddiad ni
eich herfeiddiad chi
eu herfeiddiad nhw/hwy
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