1. instinctively as a matter of instinct
  2. instinctive unthinking
  3. superficial of, affecting, or being on or near the surface
  4. ionizing radiation high-energy radiation capable of producing ionization in substances through which it passes
  5. installment credit a loan repaid with interest in equal periodic payments
  6. nostalgic unhappy about being away and longing for familiar things
  7. instantaneously without any delay
  8. Winston Churchill British statesman and leader during World War II
  9. installment rate the amount of money paid out per unit time
  10. installing the act of installing something (as equipment)
  11. installation charge the charge for installing something
  12. artificial contrived by art rather than nature
  13. instilling teaching or impressing upon the mind by frequent instruction or repetition
  14. instigative arousing to action or rebellion
  15. instinct inborn pattern of behavior often responsive to stimuli
  16. instant replay the immediate rebroadcast of some action (especially sports action) that has been recorded on videotape
  17. installation the act of setting something up for use
  18. Stalingrad a city in the European part of Russia on the Volga
  19. insightful exhibiting clear and deep perception
  20. instantaneous occurring with no delay