Where does “dunderheadism” come from?

dunderheadism (English) comes from English dunderhead, from English head, from English -y, from Middle English -y, from Old English -iġ, from Proto-West Germanic -g, from Proto-Germanic -gaz, from Proto-Indo-European -ḱos — -y, -ic.

dunderheadism (English): stupidity

Definitions

  1. stupidity

Ancestry of “dunderheadism”, step by step

dunderheadism traces back through two separate lines of ancestry.

via English dunderhead

StepLanguageWordMeaning
1EnglishdunderheadA stupid person; a dunce
2EnglishheadThe part of the body of an animal or human which...
3English-yAdded to nouns and adjectives to form adjectives...
4Middle English-yDesignates an adjective, in many cases formed by...
5Old English-iġ-y, -ic
6Proto-West Germanic-gForms adjectives from nouns and verbs with a...
7Proto-Germanic-gaz-y
8Proto-Indo-European-ḱos-y, -ic

via English ism

StepLanguageWordMeaning
1EnglishismAn ideology, system of thought, or practice that...
2English-ismUsed to form nouns of action or process or result...
3Latin-ismus-ism
4Ancient Greek-ισμόςForms abstract nouns
5Ancient Greek-μόςForms abstract nouns
6Proto-Indo-European-mósCreates action/result nouns from verb stems
Every word from Proto-Indo-European -ḱosEvery word from English -yEvery word from Old English -iġ