1. Ubiquitous - being present everywhere at once
2. Ulterior - lying beyond what is openly revealed or avowed
3. Ultimatum - a final peremptory demand
4. Umbrage - a feeling of anger caused by being offended
5. Unabashed - not embarrassed
6. Unalterable - not capable of being changed
7. Unambiguous - having or exhibiting a single clearly defined meaning
8. Unanimous - in complete agreement
9. Unappreciated - having value that is not acknowledged
10. Unapproachable - reserved and discouraging intimacies
11. Unassailable - impossible to attack
13. Unassuming - not arrogant
14. Unattainable - impossible to achieve
15. Unbiased - without prejudice
16. Unbridled - not restrained or controlled
17. Uncanny - surpassing the ordinary or normal
18. Uncharted - not yet surveyed or investigated
19. Uncommunicative - not inclined to talk or give information or express opinions
20. Unconditional - not subject to any restrictions or limitations
21. Unconscious - lacking awareness and the capacity for sensory perception
22. Unconventional - not conforming to standards
23. Uncouth - lacking refinement or cultivation or taste
24. Unction - anointing as part of a religious ceremony or healing ritual
25. Unctuous - unpleasantly and excessively suave or ingratiating
26. Undaunted - resolutely courageous
27. Underscore - give extra weight to
28. Undulate - move in a wavy pattern or with a rising and falling motion
29. Unencumbered - not burdened with cares or responsibilities
30. Unequivocal - admitting of no doubt or misunderstanding
31. Unexceptionable - completely acceptable; not open to reproach
32. Unfaltering -marked by firm determination or resolution; not shakable
33. Unfathomable - resembling an abyss in depth; so deep as to be immeasurable
34. Unfettered - not bound or restrained, as by shackles and chains
35. Unfledged - young and inexperienced
36. Unfounded - without a basis in reason or fact
37. Ungainly - lacking grace in movement or posture
38. Unguent - preparation applied externally as a remedy or for soothing
39. Unilateral - involving only one part or side
40. Unimpeachable - beyond doubt or reproach
41. Uninhibited - not restrained
42. Unison - the act of occurring together or simultaneously
43. Universal - applicable to or common to all members of a group or set
44. Unjust - not fair; marked by injustice or partiality or deception
45. Unjustified - lacking authorization
46. Unkempt - not properly maintained or cared for
47. Unlicensed - lacking official approval
48. Unmitigated - not diminished or moderated in intensity or severity
49. Unobtainable - not capable of being acquired
50. Unobtrusive - not undesirably noticeable
51. Unprecedented - novel; having no earlier occurrence
52. Unprepossessing - creating an unfavorable or neutral first impression
53. Unpretentious - not behaving in an artificial way to impress others; natural
