in English is:

cheerfulness

,

conviviality

Mutations

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

Use

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