in English is:

environmentalism

Mutations

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

Use

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