5. Dennis the Menace's mom

10. "More than I wanted to know," in brief

13. Ancient halls

14. Capital at the foot of Mount Vitosha

15. Pointedly avoid

16. York and Friday: abbr.

17. Purest of spirit, perhaps

19. Wheat-based meat substitute

21. Find objectionable

22. Not a company man?

23. Fit well, so as hardly to be noticed

25. Prelim

27. Triage consideration

28. Cardinal's insignia

29. Relatives of hootenannies

32. Combined Latin/Jamaican/hip-hop genre

33. Statute with a built-in expiration date

34. "God, home and country" org.

37. Overcast sky, to some

39. Easily beyond

41. Home of the West Coast's Empire College

44. Capital near Green Peter Lake

45. Hotel room amenity

46. Cozumel bread

47. Basic

50. Did groundbreaking work?

51. Kiss hit "Rock and Roll All __"

52. Doorbell sound

53. Backless shoe

54. Wile E. Coyote order, often

55. Service songs

56. "__ never work!"

1. Some residents, by census classification

2. Barely best

3. __ detachment

4. Medium for Mary Cassatt

5. Part of AARP: abbr.

6. "Mahalo nui __" ("Thank you very much," in Hilo)

7. Bee Gees hit "__ Can't Have You"

8. 1960 Jerry Lewis fairy tale spoof

9. __ kitchen

10. __ of March

11. 1968 VP candidate Edmund

12. Mean

15. It's in hymns but not hymnals?

18. Start of a trip, for short?

20. Having surfaced

23. Like some Netflix series, perhaps

24. Emissaries

26. They're hard to see through

30. What makes lists briefer, briefly

31. "Me too" relative

32. Length at the cineplex

33. Keystone Kops creator Mack

34. Apportion

35. U.S. diplomat W. __ Harriman

36. Modernize

37. Actor Haley Joel __ of "The Sixth Sense"

38. Like many rebates

40. Vietnamese sandwich

42. Homer's dad

43. Spread with hands

46. Hair treatments

48. Draw a bead on, with "at"

49. Veep before LBJ