1. inevitable incapable of being avoided or prevented
  2. American football a game played by two teams of 11 players on a rectangular field 100 yards long; teams try to get possession of the ball and advance it across the opponents goal line in a series of (running or passing) plays
  3. impossible not capable of happening or being done or dealt with
  4. imponderable difficult or impossible to evaluate with precision
  5. important significant in effect or meaning
  6. impossibly to a degree impossible of achievement
  7. impotently in a helpless manner
  8. rugby football a form of football played with an oval ball
  9. importunately in a beseeching manner
  10. impassable incapable of being gone across or through
  11. importantly in a significant way or to a significant degree
  12. imputable capable of being assigned or credited to
  13. composite material strong lightweight material developed in the laboratory
  14. association football a football game in which two teams of 11 players try to kick or head a ball into the opponents' goal
  15. impassively in an impassive manner
  16. touch football a version of American football in which the ball carrier is touched rather than tackled
  17. masked ball a ball at which guests wear costumes and masks
  18. passed ball a pitch that the catcher should have caught but did not
  19. ambassadorial of or relating to or characteristic of ambassadors
  20. unprofitable producing little or no profit or gain