in English is:

rationalism

Mutations

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

Use

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