Wunderbar! is a German expression that is used to express joy and appreciation. It is often translated as 'WONDERFUL' or 'MARVELOUS'. The two crossword solutions, FAB and GREAT, are both English words that can be used to express the same sentiment as Wunderbar!. FAB is an abbreviation of the word 'FABULOUS', which means extraordinary or WONDERFUL. GREAT is an adjective that means excellent or remarkable. Both words can be used to express admiration and appreciation for something.