The two nations share no common language, and as for Islamic traditions, there is a deep divide.

NPR: Iran and Syria: An Alliance Shaped by Mutual Foes

The only contact with the foreign Trailmen is through trade conducted once a year in silence and by sign language, since the isolated tribes are thought to have no common language.

NPR: From New York State: Science, Fiction and Bar Yarns

This novel, Emmanuel Darley's second, is the story of an exclusive love that turns into a nightmare, perhaps because the protagonists have no common language: the boy is enclosed in the simplicity of his own world, the little girl only laughs or cries, and the police speak only the language of the law.

ECONOMIST: Fiction from France