addle-head addle egg • addlebrain · · · Info · Definitions · Synonyms · Characters · · addle-head · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) a person with confused ideas; incapable of serious thought. Synonyms: addlehead, loon, birdbrain. · · Noun Definition 1 Synonyms · · · addlehead · · Synonym 1 loon · · Synonym 2 birdbrain · · Synonym 3 Characters · · - hyphen-minus U+002D 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