Where does “thickheaded” come from?

thickheaded (English) comes from English headed, 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.

thickheaded (English): stupid, obtuse or dumb

Definitions

  1. stupid, obtuse or dumb

Ancestry of “thickheaded”, step by step

thickheaded traces back through two separate lines of ancestry.

via English headed

StepLanguageWordMeaning
1EnglishheadedOf a sheet of paper: having the sender's name,...
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 thick

StepLanguageWordMeaning
1EnglishthickRelatively great in extent from one surface to...
2Middle EnglishthikkeAlternative form of thicke
3Old Englishþiccethick
4Proto-West Germanicþikkwīthick
5Proto-Germanicþekuzthick
6Proto-Indo-Europeantégusthick
7Proto-Indo-Europeanteg-

Words derived from “thickheaded

Every word from Proto-Indo-European -ḱos