
der Besserwisser
know-it-all
A person who believes they know everything better than others and often expresses this without being asked and in a lecturing way. The term has a negative connotation.
Niemand mag mit ihm diskutieren, weil er so ein unerträglicher Besserwisser ist.
No one likes discussing things with him because he is such an unbearable know-it-all.
