gadawiad heibio

== Welsh == === Etymology === gadael heibio (“to leave off, to omit”) +‎ -iad. === Noun === gadawiad heibio m (uncountable) (idiomatic) omission, neglect Synonyms: esgeulustod, gwall, anwaith === References === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “gadawiad heibio”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies