This adjective means speaking a foreign tongue or language—characterized by a different language than one's own. In 1 Corinthians 14:21, Paul quotes Isaiah 28:11 about God speaking to Israel through people of foreign tongues—the Assyrian invaders whose strange language signaled judgment. The compound combines 'other' (heteros) with 'tongue/language' (glōssa). Classical usage described both foreign speakers and animals with diverse tongues. The multilingual evidence varies: other tongues, otras lenguas (other languages), parlant d'autres langues—some emphasizing linguistic diversity, others foreignness.