The term COMMITS A DEADLY SIN can be broken down into two crossword solutions, LUSTS (5 letters) and ENVIES (6 letters). The seven deadly sins are a classification of vices that have been used since early Christian times to educate and instruct followers concerning fallen humanity's tendency to sin. Lust and envy are two of the seven deadly sins, which include pride, greed, wrath, gluttony, and sloth. Committing any of these sins is considered a serious offense in many religions.