1. tenacity persistent determination
  2. think out consider carefully and rationally
  3. density the amount per unit size
  4. thin out make sparse
  5. insight clear or deep perception of a situation
  6. insidious working or spreading in a hidden and usually injurious way
  7. tensity the physical condition of being stretched or strained
  8. tensed having inflections to indicate tense
  9. ethnicity an affiliation resulting from racial or cultural ties
  10. downside a negative aspect of something that is generally positive
  11. tonicity the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli
  12. transit a journey
  13. thirst a physiological need to drink
  14. dynasty a sequence of powerful leaders in the same family
  15. dine out eat at a restaurant or at somebody else's home
  16. toss out throw or cast away
  17. dynast a hereditary ruler
  18. tinsmith someone who makes or repairs tinware
  19. tinseled glittering with gold or silver
  20. thirsty feeling a need or desire to drink