Where does “thickhead” come from?

thickhead (English) comes 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.

thickhead (English): Someone stupid; Any of several species of...

Definitions

  1. Someone stupid; Any of several species of...

Ancestry of “thickhead”, step by step

thickhead traces back through two separate lines of ancestry.

via English head

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