We found 3 dictionaries that define the word roundheadedness:

General (3 matching dictionaries)

1. roundheadedness: Merriam-Webster
2. roundheadedness: Collins English Dictionary
3. roundheadedness: Dictionary.com

(Note: See roundheaded as well.)

Definitions from Wiktionary (roundheaded) ▸ adjective:  Having a round head or top. ▸ Also see roundheaded ▸ Words similar to roundheadedness ▸ Usage examples for roundheadedness ▸ Idioms related to roundheadedness ▸ Wikipedia articles (New!) ▸ Popular nouns described by roundheadedness ▸ Words that often appear near roundheadedness ▸ Rhymes of roundheadedness ▸ Invented words related to roundheadedness