1. entertaining agreeably diverting or amusing
  2. impertinent improperly forward or bold
  3. infuriating extremely annoying or displeasing
  4. pertinent being of striking appropriateness
  5. inspiriting cheerfully encouraging
  6. unthreatening not unfriendly or threatening
  7. unpretending not ostentatious
  8. unsporting violating accepted standards or rules
  9. unfastening loosening the ties that fasten something
  10. impertinence the trait of being rude and inclined to take liberties
  11. ingraining teaching or impressing upon the mind by frequent instruction or repetition
  12. undertaking any piece of work that is attempted
  13. interpreting an explanation of something that is not immediately obvious
  14. inopportuneness the quality of occurring at an inconvenient time
  15. inbreeding the act of mating closely related individuals
  16. entertainingly in an entertaining manner
  17. operating involved in a kind of operation
  18. informing to furnish incriminating evidence to an officer of the law
  19. inopportune not suitable for a purpose
  20. information knowledge acquired through study or experience