The term 'cause underlying' can be broken down into three separate words: REASON, SEETHE, and sins. REASON is a six-letter word that refers to the basis for an action or belief. SEETHE is also a six-letter word that means to be filled with intense anger or frustration. Lastly, sins is a four-letter word that refers to immoral or wrongful acts. Together, these words can be used to describe the root cause of a problem or situation.