în ruptul capului

Etymology
lit. 'should one’s head be ripped off', in an unusual and archaic construction.

Adverb

 * 1)  under no circumstances, to save one’s life
 * 2)  not at all
 * 1)  not at all
 * 1)  not at all

Usage notes
Considered a negative construction for the purposes of double negative. Often preceded by.