in English is:

defiance

Mutations

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

Use

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