She had been reared monolingually.    From Wordnet, Princeton University. 

But either someone has exposed my real-life housekeeping habits-which are, shall we say, mellow-or I am at the wrong end of some infallible ethnic equation: most, but by no means all, of the working housekeepers I see on my job searches are African Americans, Spanish-speaking, or refugees from the Central European post-Communist world, while servers are almost invariably white and monolingually English-speaking.    From Wordnik.com.  [Nickel and Dimed]

In the UK 70% of the population Punjabi is used speak English by 1.3 million monolingually Scotland people in the UK 1% speak Gaelic (2001) Newcastle (Geordie).    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

"The process of receiving schooling through two languages seems to stimulate students 'intellectual development to still higher levels than what they would attain if schooled monolingually," Collier said, adding that the native English speakers have the benefit of acquiring academic proficiency in the second language.    From Wordnik.com.  [Madison.com - top] Reference