The phrase "heinous sin" refers to an extremely evil or wicked act that is considered morally wrong and abhorrent. It usually describes a grave offense committed intentionally, causing great harm or suffering to others. Full definition
Child Abduction - Parental child abduction is a particularly heinous sin that surfaces in some divorce cases. (divorcecourtattorneys.com)
In Ephesians 5:1 - 13 Paul talks about relating to other professing Christians who commit heinous sins. (rachelheldevans.com)
Drunkenness may not be at the top of God's list of most heinous sins; neither should it be tossed aside as a relic of American fundamentalism. (relevantmagazine.com)