bilingual vs double-tongued

bilingual

adj
  • Spoken or written in two different languages. 

  • Hypernym: multilingual 

  • Having the ability to speak two languages. 

  • Characterized by the use or presence of two languages. 

noun
  • A person who is able to use two languages. 

double-tongued

adj
  • Saying one thing to one person and something different to another; double talking; deceitful in speech. 

How often have the words bilingual and double-tongued occurred in a corpus of books? (source: Google Ngram Viewer )