NorwegianTåkefyrsteSomeone who deliberately expresses themselves in an unclear manner in order to impress or to mislead you.

https://ordbok.uib.no/TÅKEFYRSTE The literal translation is "fog lord". It describes someone who is using "foggy" language to deliberately confuse you. They can sound very intellectual and impressive if you don't see through them, but without actually saying anything at all.