difeddwl

di- (“-less”) +‎ meddwl (“thought, mind”).

• (North Wales) IPA^(key): /diˈvɛðʊl/
• (South Wales) IPA^(key): /diˈveːðʊl/, /diˈvɛðʊl/

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

1. thoughtless, unthinking

   Synonym: anfeddylgar

2. heedless, inconsiderate

   Synonyms: di-hid, dihidio, difater, anystyrgar

3. imprudent

   Synonyms: angall, annoeth

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