12 letters · 15 points in Scrabble
noun the illegitimate offspring of unmarried parents
adjective contrary to or forbidden by law
adjective of marriages and offspring; not recognized as lawful
originFirst attested in 1536, from Latin illēgitimus, most likely an adapted borrowing of Middle French illegitime, equivalent to il- + legitimate, see -ate (etymology 1, 2 and 3).
Etymology from Wiktionary, CC BY-SA 3.0