The term 'Frightfully Bizarre' can be broken down into two words: 'Frightfully' and 'Bizarre'. The first word, 'Frightfully', is an adverb meaning 'EXTREMELY' or 'VERY'. The second word, 'Bizarre', is an adjective meaning 'STRANGE' or 'UNUSUAL'. Together, the two words describe something that is EXTREMELY STRANGE or UNUSUAL. The crossword solution for this term is 'EERIE', which is an adjective meaning 'strangely frightening'. Therefore, the term 'Frightfully Bizarre' can be defined as something that is EXTREMELY STRANGE and frightening.