1. unbelievable beyond understanding
  2. indefinite quantity an estimated quantity
  3. unbelievably not easy to believe
  4. variable quantity a quantity that can assume any of a set of values
  5. numerical quantity a quantity expressed as a number
  6. fundamental quantity one of the four quantities that are the basis of systems of measurement
  7. believability the quality of being believable or trustworthy
  8. unknown quantity a factor in a given situation whose bearing and importance is not apparent
  9. unsolvability the property that makes it impossible to solve
  10. complex quantity (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1
  11. unavoidable casualty a natural and unavoidable catastrophe that interrupts the expected course of events
  12. in large quantities on a large scale without careful discrimination
  13. unpalatability the property of being unacceptable to the mind
  14. unpalatableness the property of being unacceptable to the mind
  15. public nudity vulgar and offensive nakedness in a public place
  16. unbelievingly in an incredulous manner
  17. universal quantifier a logical quantifier of a proposition that asserts that the proposition is true for all members of a class of things
  18. relative quantity a quantity relative to some purpose
  19. inapplicability irrelevance by virtue of being inapplicable to the matter at hand
  20. definite quantity a specific measure of amount