1. optimistic hopeful that the best will happen in the future
  2. responsibility the social force that binds you to a course of action
  3. optimization the act of rendering optimal
  4. impossibility incapability of existing or occurring
  5. indispensability the quality possessed by something that you cannot possibly do without
  6. optimisation the act of rendering optimal
  7. observation post an elevated post affording a wide view
  8. irresponsibility the trait of lacking trustworthiness or reliability
  9. organization expense the cost of organizing a new corporation or partnership
  10. inadmissibility unacceptability as a consequence of not being admissible
  11. admissibility acceptability by virtue of being admissible
  12. Onoclea sensibilis beautiful spreading fern of eastern North America and eastern Asia naturalized in western Europe; pinnately divided fronds show a slight tendency to fold when touched; pinnules enclose groups of sori in beadlike lobes
  13. impossibleness incapability of existing or occurring
  14. mission impossible an extremely dangerous or difficult mission
  15. civic responsibility the responsibilities of a citizen
  16. impossible not capable of happening or being done or dealt with
  17. insensibility devoid of passion or feeling; hardheartedness
  18. unquestionability the quality of being beyond question or dispute or doubt
  19. hospitalization insurance insurance that pays all or part of a patient's hospital expense
  20. permissibility admissibility as a consequence of being permitted