addlehead addlebrained • addleheaded · · · Info · Definitions · Synonyms · Characters · · addlehead · · Text Latin · · Script 9 · · Length Definitions · · · (noun) a person with confused ideas; incapable of serious thought. Synonyms: addle-head, loon, birdbrain. · · Noun Definition 1 Synonyms · · · addle-head · · Synonym 1 loon · · Synonym 2 birdbrain · · Synonym 3 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C