in English is:

solipsism

Mutations

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

Use

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