FromProto-Celtic*reidom(“ride”), semantically bleached into an abstract suffix.

• (North Wales)IPA^(key): /rʊɨ̯ð/
• (South Wales)IPA^(key): /rʊi̯ð/

-rwydd m

1. forming abstract nouns,-ness,-ment

   ‎sicr(“certain”) + ‎-rwydd → ‎sicrwydd(“certainty”)

   ‎hapus(“happy”) + ‎-rwydd → ‎hapusrwydd(“happiness”)

   ‎amherffaith(“imperfect”) + ‎-rwydd → ‎amherffeithrwydd(“imperfection”)

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “-rwydd”, inGeiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies

• Welsh terms inherited from Proto-Celtic
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