Synonyms to dead language

vernacular, Babbittish, Philistine, aboriginal, accustomed, ancient language, argot, austerity, autochthonous, average, baldness, bareness, bourgeois, campy, candor, cant, classical language, colloquial, colloquial speech, colloquial usage, colloquialism, common, common speech, commonplace, confined, conventional, conversational, conversationalism, current, customary, directness, easy, endemic, everyday, familiar, frankness, general, geographically limited, gibberish, gobbledygook, habitual, high-camp, homebred, homegrown, homely, homespun, household, household words, idiom, illiterate speech, indigenous, informal, informal English, informal language, informal speech, insular, jargon, kitschy, language, leanness, limited, lingo, living language, local, localized, low-camp, matter-of-factness, mother tongue, mumbo jumbo, natal, native, native language, native speech, native tongue, native-born, naturalness, nonstandard, normative, of a place, openness, ordinary, original, parent language, parochial, patois, patter, phraseology, plain, plain English, plain speaking, plain speech, plain