| Union acquisition? | 18 |
| Union acquisition | 17 |
| Union accord? | 13 |
| Union abbr. | 11 |
| Union in 1860s | 15 |
| Union for one | 14 |
| Union | 5 |
| Uninvolved; easygoing | 21 |
| Uninvolved | 10 |
| Uninviting to a vegan, e.g. | 27 |
| Uninviting to a vegan | 21 |
| Uninviting look | 15 |
| Uninvited wedding guest | 23 |
| Uninvited swine? | 16 |
| Uninvited rooter | 16 |
| Uninvited picnic guests | 23 |
| Uninvited picnic attendee | 25 |
| Uninvited partygoer | 19 |
| Uninvited party guest | 21 |
| Uninvited ones | 14 |
| Uninvited one | 13 |
| Uninvited house guest? | 22 |
| Uninvited guests | 16 |
| Uninvited guest | 15 |
| Uninvited cornfield guest | 25 |
| Uninvited cookout guest? | 24 |
| Uninvited burrower | 18 |
| Uninvited attendee | 18 |
| Unintuitive thing for language learners | 39 |
| Uninterruptedly | 15 |
| Uninterrupted space | 19 |
| Uninterrupted series | 20 |
| Uninterrupted sequence | 22 |
| Uninterrupted | 13 |
| Uninterpreted info | 18 |
| Uninteresting, like a show | 26 |
| Uninteresting voice | 19 |
| Uninteresting types | 19 |
| Uninteresting structural support? | 33 |
| Uninteresting South Dakota municipality? | 40 |
| Uninteresting secondhand garment? | 33 |
| Uninteresting progress report | 29 |
| Uninteresting persons | 21 |
| Uninteresting one | 17 |
| Uninteresting North Pacific area? | 33 |
| Uninteresting New York waterway? | 32 |
| Uninteresting hike? | 19 |
| Uninteresting chore? | 20 |
| Uninteresting Arizona attraction? | 33 |
| Uninteresting | 13 |
| Uninterested in working | 23 |
| Uninterested in right or wrong | 30 |
| Uninterested | 12 |
| Unintentional revelation | 24 |
| Unintentional poker table signals | 33 |
| Unintentional | 13 |
| Unintended upshot | 17 |
| Unintended spot | 15 |
| Unintended radio broadcast silence | 34 |
| Unintended movement | 19 |
| Unintended consequences | 23 |
| Unintended consequence | 22 |
| Unintelligible writing to me | 28 |
| Unintelligible talking | 22 |
| Unintelligible speech, informally | 33 |
| Unintelligible chatter | 22 |
| Unintelligible | 14 |
| Unintelligibility | 17 |
| Unintelligent | 13 |
| Unintelligence | 14 |
| Unintellectual | 14 |
| Uninspiring, slangily | 21 |
| Uninspiring talk | 16 |
| Uninspiring lecturers, e.g. | 27 |
| Uninspiring | 11 |
| Uninspired version | 18 |
| Uninspired teaching method | 26 |
| Uninspired restaurant order, with "the" | 49 |
| Uninspired restaurant order (with "the") | 50 |
| Uninspired reactions | 20 |
| Uninspired new version | 22 |
| Uninspired learning method | 26 |
| Uninspired Father's Day gift | 32 |
| Uninspired excuse | 17 |
| Uninspired course | 17 |
| Uninspired costar of Bob Hope? | 30 |
| Uninspired book | 15 |
| Uninspired adaptation | 21 |
| Uninspired | 10 |
| Uninjured, after "in" | 31 |
| Uninjured | 9 |
| Uninitiated ones | 16 |
| Uninitiated in | 14 |
| Uninitiated | 11 |
| Uninhibitedly energetic | 23 |
| Uninhibited shouts | 18 |
| Uninhibited party | 17 |
| Uninhibited frolic | 18 |
| Uninhibited | 11 |
| Uninherited land | 16 |