in English is:

Dadaism

Mutations

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

* This form is an exception to the mutation rules.

Use

y Dadaiaeth hon
fy Dadaiaeth i
dy Dadaiaeth di
ei Dadaiaeth ef/o
ei Dadaiaeth hi
ein Dadaiaeth ni
eich Dadaiaeth chi
eu Dadaiaeth nhw/hwy
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