Across  3. Druggist. 4. It shows life. 5. Haphazardly. 8. Half full outlook. 11. Certainty. 12. Take over by force. 13. A person who has to have everything right. 15. He writes long stories. 17. Hiding place. 18. Tickles the ivories. 20. All alone he sings. 21. Janitor. 22. Satisfy. 24. An optimist usually has this too. 25. Disbelief. 26. Animal doctor. 27. Keeps track of the past. 28. Horse related. 29. Merciless. 30. He likes to fit in. 31. He tells jokes.

Down  1. It's not always negative. 2. Deceive. 3. A senator is one. 6. Legally responsible for you. 7. Walker. 9. Idiosyncrasy. 10. Many. 14. Stopping. 16. Axe-slinger. 18. He thinks it's half empty. 19. Also a non-30A. 21. Not of the military. 23. Runs the library.