Wiktionary
absolute impediment
n. (context legal English) A diriment impediment that prevents a person from marrying, but does not require punishment or an annulment.(R:MW3 1976: page=7)
Usage examples of "absolute impediment".
The fact that a war against Iraq could be potentially quite costly should make us think long and hard about whether or not we should embark upon such an endeavor, but it should never be an absolute impediment.
He did not remember to have met during his long career an invincible resistance or an absolute impediment.
And Father O'Malley said that even if I got one, the church would never let me marry Dennis because we had already committed adultery together and it was an 'absolute impediment to matrimony.