in English is:

devilment

,

mischief

Mutations

Soft:gythreuldeb
Nasal:nghythreuldeb
Aspirate:chythreuldeb

Use

y cythreuldeb hwn
fy nghythreuldeb i
dy gythreuldeb di
ei gythreuldeb ef/o
ei chythreuldeb hi
ein cythreuldeb ni
eich cythreuldeb chi
eu cythreuldeb nhw/hwy
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