A singlelingual is a person who is truly by themselves. They are incapable of making any meaningful connections, and they can also not speak more than one language.
“Hey, have you seen Jerry around recently?”
“Nah, he’s a total singlelingual.”
“Wow, what a loser.”
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".