Unceremonious.

Ceremony. Rite.  The Catholic Mass is a rite for the faithful.  It is a beautiful ceremony that glorifies God.  I read of a Protestant minister who converted to Catholicism because he found the Catholic rites so much beautiful, sacred and a true tribute to Jesus.

Aside from the mass itself, other beautiful Catholic rites include baptism, confirmation, and wedding.

My father was a Catholic while my mother was an Aglipay.  So we, children except for two, were all first baptized as Aglipays, then were converted to Catholicism. 

Unceremonious.  Without the due formalities, abrupt. Some relationships, engagements, and friendships are ended without any formal notices.

The parties involved could choose closure; others simply coast along, some get hitched, for the right or wrong reasons; still others wander from one relationship to another.