| A | B |
| Frugal | not wasteful, economical |
| Foible | a small weakness or character flaw |
| Felon | a person guilty of a major crime; criminal |
| Fiasco | something that is an utter and complete disaster |
| Finite | something that has a limit that can't be exceeded |
| Flagrant | something that is obviously wrong or offensive in some way |
| Futile | something that won't succeed or is unimportant |
| Fastidious | 1.Possessing or displaying careful, meticulous attention to detail |