1. Keen
5. Guide
9. Industriousness
10. Airhead
11. Dense
12. Coin opening
13. Encountered
14. A deep ravine
16. Consumer Price Index
18. Historical periods
21. Competition involving speed
23. Story
24. Large long-armed ape
25. Join metal
26. Annoyance
1. Tallies
2. Six-stringed instrument
3. Irrational
4. Repeat an action or statement
5. Directed from the front
6. Count
7. Highest point
8. Amount owed
15. Outfit
16. Black bird
17. Cut back
19. "Oh, my!"
20. Dispatched
22. Armageddon