treiddiol

== Welsh == === Etymology === From treiddio (“to penetrate”) +‎ -ol === Adjective === treiddiol (feminine singular treiddiol, plural treiddiol, equative mor dreiddiol, comparative mwy treiddiol, superlative mwyaf treiddiol) penetrating Synonym: treiddgar (figurative) shrewd, astute Synonyms: craff, miniog ==== Derived terms ==== hydreiddiol (“pervading”) treiddioldeb (“penetration”) treiddiolrwydd (“penetration; astuteness”) === Mutation === === Further reading === D. G. Lewis, N. Lewis, editors (2005–present), “treiddiol”, in Gweiadur: the Welsh–English Dictionary, Gwerin R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “treiddiol”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies