Most likely the most powerful curseword ever created by mankind. Cannot be translated without loss. Versatile word that can be used alone or repeated indefinitely.
Originally name of the tunder god. In the christian era used as a name of the Satan. Perkele is such a powerful word, bacause it includes both of these connotations and in addition is very often associated with 'sisu', the attitude of never ever giving up.
"Perkele", in frustration.