in English is:

idealism

Mutations

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

Use

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