gwrthwyneb

gwrth- (“anti-, contra-”) +‎ wyneb (“face”).

gwrthwyneb m (plural gwrthyddion)

1. opposite, reverse, inverse, contrary

   Synonym: gwrthydd

   Antonym: cyfystyr

2. back, reverse side

   Synonym: cefn

3. nausea, sickness

   Synonyms: cyfog, salwch

gwrthwyneb (feminine singular gwrthwyneb, plural gwrthwyneb, not comparable)

1. opposite, opposed, contrary

   Synonyms: cyferbyniol, croes, cyfarwyneb

• Griffiths, Bruce; Glyn Jones, Dafydd (1995), “contrary”, in Geiriadur yr Academi: The Welsh Academy English–Welsh Dictionary‎^[1], Cardiff: University of Wales Press, →ISBN
• Griffiths, Bruce; Glyn Jones, Dafydd (1995), “opposite”, in Geiriadur yr Academi: The Welsh Academy English–Welsh Dictionary‎^[2], Cardiff: University of Wales Press, →ISBN
• D. G. Lewis, N. Lewis, editors (2005–present), “gwrthwyneb”, in Gweiadur: the Welsh–English Dictionary, Gwerin
• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “gwrthwyneb”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies