Related Clues:

• Strangely timid ciao spoken like a native
• Keeping mum surrounded by asinine vernacular
• "... a poet should take particular care to guard himself against — ways of speaking" (Addison, The Spectator)
• Hard to translate, in a way
• Silly to include mother in the vernacular
• Expressed in distinctive or metaphorical way
• Natural fool in charge, arts graduate brought in
• It's foolish restricting mother with natural expressions
• The old woman filling potty, in a manner of speaking
• Close relative's crazy about conforming to established usage
• Man with papers, reportedly Greek native?
• Using common language, mum punches halfwit in charge
• Using expressions natural to a native speaker
• Stupid to keep mum regarding one variety of language
• Like much spoken language