The Collaborative International Dictionary of English v.0.48:
Addle-brain \Ad"dle-brain`\, Addle-head \Ad"dle-head`\, Addle-pate \Ad"dle-pate\, n. A foolish or dull-witted fellow. [Colloq.] [1913 Webster] Addle-headed Addle-brainedWordNet (r) 3.0 (2006):
addle-head n 1: a person with confused ideas; incapable of serious thought [syn: addle-head, addlehead, loon, birdbrain]