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We found 6 dictionaries with English definitions that include the word knuckleheaded:
Click on the first link on a line below to go directly to a page where "knuckleheaded" is defined.

General (6 matching dictionaries)

1. knuckleheaded: Merriam-Webster.com [home, info]
2. knuckleheaded: Collins English Dictionary [home, info]
3. knuckleheaded: Wordnik [home, info]
4. knuckleheaded: Wiktionary [home, info]
5. knuckleheaded: Dictionary.com [home, info]
6. knuckleheaded: Dictionary/thesaurus [home, info]

(Note: See knuckleheads for more definitions.)

▸ Also see knuckleheads ▸ Words similar to knuckleheaded ▸ Usage examples for knuckleheaded ▸ Idioms related to knuckleheaded (New!) ▸ Words that often appear near knuckleheaded ▸ Rhymes of knuckleheaded ▸ Invented words related to knuckleheaded