French phrase
Je n'étais pas au courant.
Meaning
I wasn't aware of that.
When to use it
Expresses a lack of knowledge about something. It is a polite way to respond when information was not previously received.
Example dialogue
Tu sais que le cours commence à 14h ?
Do you know the class starts at 2 p.m.?
Je n'étais pas au courant.
I wasn't aware of that.