10 letters · 17 points in Scrabble
noun an illiterate person who does not know the alphabet
originFrom Late Latin analphabetus (“unable to read and write; illiterate”), from Ancient Greek ἀναλφάβητος (analphábētos, “illiterate”), from ἀν- (an-, “un-”) + ἀλφάβητος (alphábētos, “alphabet”); analysable as an- + alphabet. The English word was probably influenced by cognate words in other languages such as French analphabète (adjective), German Analphabetus, Analphabet (nouns), analphabeten…
Etymology from Wiktionary, CC BY-SA 3.0