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Webster 1913 Edition
Thickhead
Thick′headˊ
,Noun.
 1. 
A thick-headed or stupid person. 
[Colloq.] 
2. 
(Zool.) 
Any one of several species of Australian singing birds of the genus 
Pachycephala
. The males of some of the species are bright-colored. Some of the species are popularly called thrushes
. Definition 2025
thickhead
thickhead
English
Noun
thickhead (plural thickheads)
- Someone stupid.
 - Any of several species of Australian songbirds of the genus Pachycephala.
 
Synonyms
- See also Wikisaurus:idiot