in English is:

heroism

Mutations

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

Use

yr wroniaeth hon
fy ngwroniaeth i
dy wroniaeth di
ei wroniaeth ef/o
ei gwroniaeth hi
ein gwroniaeth ni
eich gwroniaeth chi
eu gwroniaeth nhw/hwy
External

Dictionary Portal

This is a library of dictionaries and other online resources where you can search further for gwroniaeth*:

Specialist Dictionaries
Glossaries
Terminology
Encyclopedia
Example Sentences
Sentences containing:

*External websites will be opened in a new window.