The term 'One of the Seven Deadlies' refers to the seven deadly sins, which are a set of vices that have been recognized since early Christian times. The two crossword solutions for this term are 'SIN' and 'ENVY'. SIN is defined as an immoral act considered to be a transgression against divine law, while ENVY is defined as a feeling of discontent or covetousness with regard to another's advantages, success, or possessions. Both of these vices are considered to be among the seven deadly sins.