in English is:

casuistry

,

sophistry

Mutations

Soft:gaswistiaeth
Nasal:nghaswistiaeth
Aspirate:chaswistiaeth

Use

y gaswistiaeth hon
fy nghaswistiaeth i
dy gaswistiaeth di
ei gaswistiaeth ef/o
ei chaswistiaeth hi
ein caswistiaeth ni
eich caswistiaeth chi
eu caswistiaeth nhw/hwy
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