ansylweddol

an- (“un-”) +‎ sylweddol (“substantial”)

• (North Wales) IPA^(key): /ansəlˈwɛðɔl/
• (South Wales) IPA^(key): /ansəlˈweːðɔl/, /ansəlˈwɛðɔl/

ansylweddol (feminine singular ansylweddol, plural ansylweddol, equative mor ansylweddol, comparative mwy ansylweddol, superlative mwyaf ansylweddol)

1. insubstantial, immaterial

   Synonyms: disylwedd, anfaterol

• D. G. Lewis, N. Lewis, editors (2005–present), “ansylweddol”, in Gweiadur: the Welsh–English Dictionary, Gwerin
• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “ansylweddol”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies