Home › Words › F › fatheadednessfatheadednessfatheadedness means the quality of being fatheaded.EtymologyFrom fatheaded + -ness.nounThe quality of being fatheaded.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.fatheaded 82% match — Characteristic of a fathead; stupid vs fatheadedness →bigheadedness 75% match — the quality of being bigheaded vs fatheadedness →eggheadedness 71% match — The quality of being eggheaded. vs fatheadedness →addleheadedness 69% match — The quality of being addleheaded. vs fatheadedness →boneheadedness 69% match — The state or quality of being boneheaded. vs fatheadedness →airheadedness 68% match — The quality of being airheaded. vs fatheadedness →fattiness 67% match — The quality of being fatty. vs fatheadedness →pigheadedness 67% match — The condition of being pigheaded. vs fatheadedness →