The term 'SIN OF THE GREEN-EYED' is a reference to the sin of ENVY, which is defined as a feeling of discontentment or resentment towards someone due to their possessions, qualities, or achievements. The crossword solution for this term is ENVY, which is a four letter word. ENVY is considered one of the seven deadly sins in Christianity and is seen as a negative emotion that can lead to destructive behavior.