1. incredibleness the quality of being incredible
  2. incredulous not disposed or willing to believe; unbelieving
  3. incredible amazing; extraordinarily good or great
  4. incredulously in a disbelieving manner
  5. incredibly exceedingly; extremely
  6. incredibility the quality of being incredible
  7. incorrigible impervious to correction by punishment
  8. incurableness incapability of being cured or healed
  9. credibleness the quality of being believable or trustworthy
  10. incredulity doubt about the truth of something
  11. inaudibleness the quality of not being perceptible by the ear
  12. ingredient a component of a mixture or compound
  13. credible capable of being believed
  14. indigestibleness the property of being difficult to digest
  15. invertible having an additive or multiplicative inverse
  16. inclined plane a simple machine for elevating objects
  17. ungratefulness a lack of gratitude
  18. uncharitable lacking love and generosity
  19. incurable incapable of being remedied
  20. inevitableness the quality of being unavoidable