The term 'very evil' can be summarized by two crossword solutions: SATANIC and HEINOUS. SATANIC is an adjective that refers to the devil or anything related to him, such as his works or worship. It is derived from the Latin word 'Satanas, ' which means 'ADVERSARY.' HEINOUS is an adjective that means extremely wicked or cruel. It is derived from the Middle English word 'heynous, ' which means 'HATEFUL.' Both words are used to describe something that is very evil.