| Unorthodox thinker | 18 |
| Unorthodox sect | 15 |
| Unorthodox opinion | 18 |
| Unorthodox doctrine | 19 |
| Unorthodox debate stoppage | 26 |
| Unorthodox believer | 19 |
| Unorthodox belief | 17 |
| Unorthodox | 10 |
| Unornamented | 12 |
| Unoriginality | 13 |
| Unoriginal: Abbr. | 17 |
| Unoriginal work | 15 |
| Unoriginal types | 16 |
| Unoriginal type | 15 |
| Unoriginal story | 16 |
| Unoriginal show? | 16 |
| Unoriginal response | 19 |
| Unoriginal reply | 16 |
| Unoriginal person | 17 |
| Unoriginal people | 17 |
| Unoriginal order, with "the" | 38 |
| Unoriginal ones | 15 |
| Unoriginal one | 14 |
| Unoriginal newspaper worker? | 28 |
| Unoriginal movie? | 17 |
| Unoriginal desserts? | 20 |
| Unoriginal argument | 19 |
| Unoriginal and dull | 19 |
| Unoriginal | 10 |
| Unorganized | 11 |
| Unordinary | 10 |
| Unopposed slots in tournaments | 30 |
| Unopposed candidate: 1789 | 25 |
| Unopened, as a wine bottle | 26 |
| Unopened White album? | 21 |
| Unopened tulip | 14 |
| Unopened roses | 14 |
| Unopened rose | 13 |
| Unopened in the box | 19 |
| Unopened flowers | 16 |
| Unopened flower | 15 |
| Unopened CD contains "Go Down In Flames" | 50 |
| Unopened bloom | 14 |
| Unopened | 8 |
| Unoiled robot's problem? | 28 |
| Unofficially off-base | 21 |
| Unofficial, like some university degrees | 40 |
| Unofficial ticket source | 24 |
| Unofficial Seabees' motto | 29 |
| Unofficial promissory note | 26 |
| Unofficial poll | 15 |
| Unofficial news source | 22 |
| Unofficial end of summer | 24 |
| Unofficial discussions | 22 |
| Unofficial currency | 19 |
| Unofficial Aussie anthem | 24 |
| Unofficial advisers of a sort | 29 |
| Unofficial "Main Street" of New York's Chinatown | 62 |
| Unoccupied? | 11 |
| Unoccupied, as time | 19 |
| Unoccupied, as country | 22 |
| Unoccupied, as a theater seat | 29 |
| Unoccupied Middle Easterner, as of last month | 45 |
| Unoccupied | 10 |
| Unobtrusiveness | 15 |
| Unobtrusive, as a ringtone setting | 34 |
| Unobtrusive sound | 17 |
| Unobtrusive signals | 19 |
| Unobtrusive attention getter | 28 |
| Unobtrusive | 11 |
| Unobstructed progress | 21 |
| Unobstructed | 12 |
| Unobservant | 11 |
| Uno, ___, tres | 14 |
| Uno, un, eins, etc. | 19 |
| Uno, por ejemplo | 16 |
| Uno, in Ulm | 11 |
| Uno, for one | 12 |
| Uno, for example | 16 |
| Uno, e.g. | 9 |
| Uno, due, ___ | 13 |
| Uno, due, -- ... | 16 |
| Uno, due, -- | 12 |
| Uno, dos, ___ | 13 |
| Uno, dos, tres, -- ... | 22 |
| Uno, dos, -- | 12 |
| Uno's alternative | 21 |
| Uno y uno | 9 |
| Uno y siete | 11 |
| Uno y due | 9 |
| Uno y dos y tres | 16 |
| Uno y dos | 9 |
| Uno x 3 | 7 |
| Uno tripled | 11 |
| Uno relative | 12 |
| Uno plus uno plus uno | 21 |
| Uno plus uno | 12 |
| Uno plus due | 12 |
| Uno plus dos | 12 |
| Uno or dos, in Spain | 20 |