"Braggy" and "pedantic" do share some meaning/conotation overlap with "pretentious" but I don't think "complains a lot" or "has unreasonably high standards" really overlap (though terms for those may in Estonianl.

Another English word that is very similar in meaning is "ostentatious".

If I had to write out my own definition of "pretentious" it would be: Pretending to be higher class, more refined, more educated or more moral than you actually are and implying that makes you superior to other people.