in English is:

radicalism

Mutations

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

Use

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