1. apathetic showing little or no emotion or animation
  2. optimistic hopeful that the best will happen in the future
  3. aptitude inherent ability
  4. captivating attracting and holding interest as if by a spell
  5. optative indicating an option or wish
  6. optics the branch of physics that studies the physical properties of light
  7. tidy tips California annual having flower heads with yellow rays tipped with white
  8. tidytips California annual having flower heads with yellow rays tipped with white
  9. optimize make optimal; get the most out of; use best
  10. activating the activity of causing to have energy and be active
  11. optimise make optimal; get the most out of; use best
  12. amidships at or near or toward the center of a ship
  13. captivated filled with wonder and delight
  14. Apodiformes swifts; hummingbirds
  15. pit viper New World vipers with hollow fangs and a heat-sensitive pit on each side of the head
  16. aptness appropriateness for the occasion
  17. updating the act of changing something to bring it up to date
  18. justice of the peace a local magistrate with limited powers
  19. apterous (of insects) without wings
  20. polydipsia excessive thirst