| Unsinkable ice sheet | 20 |
| Unsinkable white sheet | 22 |
| Unskilled | 9 |
| Unskilled barber? | 17 |
| Unskilled in | 12 |
| Unskilled labor force | 21 |
| Unskilled laborer | 17 |
| Unskilled laborers | 18 |
| Unskilled labourer | 18 |
| Unskilled person | 16 |
| Unskilled persons | 17 |
| Unskilled pug | 13 |
| Unskilled sailor | 16 |
| Unskilled work | 14 |
| Unskilled worker | 16 |
| Unskilled workers | 17 |
| Unskilled writer | 16 |
| Unskilled writers | 17 |
| Unskillful | 10 |
| Unskillfully | 12 |
| Unskillfully apply | 18 |
| Unsliced bread unit | 19 |
| Unsmiling | 9 |
| Unsmooth | 8 |
| Unsociable and brooding | 23 |
| Unsociable one | 14 |
| Unsociable person | 17 |
| Unsociable sort | 15 |
| Unsociable type | 15 |
| Unsocial one | 12 |
| Unsocial sort | 13 |
| Unsocial sorts | 14 |
| Unsocial type | 13 |
| Unsoftened | 10 |
| Unsoiled | 8 |
| Unsolicited e-mail | 18 |
| Unsolicited email offers, often | 31 |
| Unsolicited mailings, for short | 31 |
| Unsolicited manuscript enc. | 27 |
| Unsolicited manuscripts | 23 |
| Unsolicited manuscripts, informally | 35 |
| Unsolicited ms. enclosure | 25 |
| Unsolicited MS., perhaps | 24 |
| Unsolicited opinion | 19 |
| Unsolicited-mail addressee | 26 |
| Unsolved burglary, e.g. | 23 |
| Unsolved cases, in TV lingo | 27 |
| Unsolved crime | 14 |
| Unsolved murder, e.g. | 21 |
| Unsolved mystery | 16 |
| Unsolved mystery, maybe | 23 |
| Unsolved question | 17 |
| Unsophis-ticated | 16 |
| Unsophisticated | 15 |
| Unsophisticated boob | 20 |
| Unsophisticated dullard, in slang | 33 |
| Unsophisticated guy | 19 |
| Unsophisticated one | 19 |
| Unsophisticated ones | 20 |
| Unsophisticated person | 22 |
| Unsophisticated quality | 23 |
| Unsophisticated sort | 20 |
| Unsophisticated sorts | 21 |
| Unsophisticated, as humor | 25 |
| Unsophisticated, narrow-minded traits | 37 |
| Unsophisticates | 15 |
| Unsorted meal | 13 |
| Unsorted wheat flour, in India | 30 |
| Unsound | 7 |
| Unsound reasoning | 17 |
| Unsound, as an argument | 23 |
| Unsounded consonant | 19 |
| Unsoundness | 11 |
| Unsparing warrior | 17 |
| Unsparingly | 11 |
| Unspeakable | 11 |
| Unspeakable acts | 16 |
| Unspeakably bad | 15 |
| Unspeakably evil | 16 |
| Unspeaking | 10 |
| Unspeaking member of the Seven Dwarfs | 37 |
| Unspecific | 10 |
| Unspecific amount | 17 |
| Unspecific brief period | 23 |
| Unspecific degree | 17 |
| Unspecific feeling | 18 |
| Unspecific ordinal number | 25 |
| Unspecific recipe amount | 24 |
| Unspecific recipe phrase | 24 |
| Unspecific recipe quantity | 26 |
| Unspecific vowel sound | 22 |
| Unspecified | 11 |
| Unspecified amount | 19 |
| Unspecified alternative | 23 |
| Unspecified amount | 18 |
| Unspecified choice | 18 |
| Unspecified culprits | 20 |
| Unspecified degree | 18 |
| Unspecified degrees | 19 |
| Unspecified degrees, in math | 28 |