EXTREMELY WICKED is a term used to describe someone who is exceptionally EVIL or immoral. The crossword solutions EVIL (4 letters), NEFARIOUS (9 letters) and FACINOROUS (10 letters) all describe someone who is extremely wicked. EVIL is a general term for something that is morally wrong, while NEFARIOUS implies a malicious intent and FACINOROUS suggests a particularly heinous act. All three words are used to describe someone who is extremely wicked.