-vuldig

From eastern dialects, perhaps especially Brabantian. The /ʏ/-vowel is from umlaut of Middle Dutch -voldich. Since the o here goes back to West Germanic *a, probably through analogical alteration of -veldich, which is attested in Limburgish texts. Compare German -fältig.

• IPA^(key): /ˈvʏldəx/

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-vuldig

1. (now rare and unproductive) alternative form of -voudig

• Only this form is standard in zorgvuldig. A limited number of other adjectives have both forms alongside, that in -vuldig being dated in all but a handful of cases.

• van der Sijs, Nicoline, editor (2010), “zorgvuldig”, in Etymologiebank, Meertens Institute