" Making use of or written in one language only."
From the freedictionary.com
What do you call a person who speaks three languages? Trilingual.
What do you call a person who speaks two languages? Bilingual.
What do you call a person who speaks one language? ________
The answer isn't monolingual.
My answer: my grandfather, my boss, my next-door neighbour, and some of my students.
People shouldn't be judged period.