1. Cluttered
2. Unappealing
3. Awkward
4. Uncomfortable
5. Unattractive
6. Fragmented
7. Unintuitive
8. Incoherent
9. Outdated
10. Limited
11. Boring
12. Uninspired
13. Unprofessional
14. Unstable
15. Insecure
16. Obsolete
17. Overly-complex
18. Unmaintainable
19. Unresponsive
20. Unclear
21. Unscalable
22. Inflexible
23. Ugly
24. Unusable
25. Unreliable
26. Overloaded
27. Poorly-executed
28. Illogical
29. Inaccessible
30. Unfocused
31. Unfriendly
32. Unbalanced
33. Overwhelming
34. Unfamiliar
35. Unoriginal
36. Buggy
37. Confusing
38. Unhelpful
39. Unpredictable
40. Incomplete
41. Unstable
42. Inefficient
43. Intimidating
44. Unsightly
45. Unwieldy
46. Unusable
47. Unsteady
48. Unattainable
49. Overly-simplistic
50. Unsustainable