I'm pretty comfortable with 'I don't know'. But I think it very important to know what you don't know. Because if you don't know that which you don't know, then you may actually know, but not know that you know. Conversely, it's probably very difficult to be in a state where you don't know what you don't know, since if you don't know, I'm not sure how you could know that you don't.
You know?
Boru
You know?
Boru
‘I can’t be having with this.’ - Esmeralda Weatherwax