bilingual

fluent

rusty

pick up a language

reasonably

get by in a language

able to speak two languages equally well because you learned them as a child

able to speak, read or write a language easily, quickly and well

not as good at a language as you used to be because you have not used it for a long time

learn a language by practicing it, rather than by learning it in a class

to a degree that is fairly good, but not very good

know just enough of a language for simple communication