in English is:

pessimism

Mutations

Soft:besimistiaeth
Nasal:mhesimistiaeth
Aspirate:phesimistiaeth

Use

y besimistiaeth hon
fy mhesimistiaeth i
dy besimistiaeth di
ei besimistiaeth ef/o
ei phesimistiaeth hi
ein pesimistiaeth ni
eich pesimistiaeth chi
eu pesimistiaeth nhw/hwy
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