trylwyredd

== Welsh == === Etymology === From trylwyr +‎ -edd. === Noun === trylwyredd m or f (plural trylwyreddau) thoroughness, exhaustiveness === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “trylwyredd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies