The term 'fails completely' can be represented by three crossword solutions: FOUNDERS (8 letters), TANKS (5 letters), and COMESACROPPER (13 letters). FOUNDERS refers to the people who start a business or organization, and if their venture fails completely, they are said to have 'TANKED'. This phrase is derived from the idea of a tank sinking to the bottom of the ocean. COMESACROPPER is an idiom meaning to fail in a spectacular way.