1. undestroyable not capable of being destroyed
  2. industriously in an industrious manner
  3. indecipherable not easily decoded
  4. industrial of or relating to commercial enterprise
  5. undesirable not wanted
  6. industrially by industrial means
  7. undecipherable not easily deciphered
  8. indubitable too obvious to be doubted
  9. indestructible not easily ruined
  10. indiscernible difficult or impossible to perceive
  11. industrious characterized by hard work and perseverance
  12. indescribable defying expression
  13. intertribal between or among tribes
  14. undesirably in an undesirable manner
  15. indisputable not open to question; obviously true
  16. inextirpable incapable of extermination or extirpation
  17. indissoluble incapable of being broken up
  18. undecipherably in an illegible manner
  19. industry the action of making of goods and services for sale
  20. Ivan the Terrible the first czar of Russia (1530-1584)