deadly sin 
noun
(In Christian tradition) a sin regarded as leading to damnation, especially one of a traditional list of seven. See the seven deadly sins at seven.But what should today's list of deadly sins include?...
- But as someone who has been known to buy new underwear to avoid having to do a load of wash, I believe sloth should be stricken from the list of deadly sins.
- Based on a book by Maurine Dallas Watkins about a true story from 1926, it rollicks with elements of pretty well all seven of the deadly sins.