in English is:

egoism

Mutations

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

Use

yr egoistiaeth hon
fy egoistiaeth i
dy egoistiaeth di
ei egoistiaeth ef/o
ei hegoistiaeth hi
ein hegoistiaeth ni
eich egoistiaeth chi
eu hegoistiaeth nhw/hwy
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