| Underwater-torpedo inventor | 27 |
| Underwater-tunnel digger | 24 |
| Underway to over there | 22 |
| Underway to over there? | 23 |
| Underway, to Sherlock Holmes | 28 |
| Underwear for the unhinged? | 27 |
| Underwear with underwire | 24 |
| Underweight delivery, maybe | 27 |
| Underwent chemical change | 25 |
| Underwent remission of fever | 28 |
| Underworld code of silence | 26 |
| Underworld meeting place | 24 |
| Underworld money lender | 23 |
| Underworld of Greek mythology | 29 |
| Underworld of mythology | 23 |
| Underworld V.I.P.'s | 23 |
| Underworld, O.T. style | 22 |
| Underwriter's assessment | 28 |
| Underwriter's concern | 25 |
| Underwriters' tasks | 23 |
| Underwriting association | 24 |
| Undeserving of a padded cell | 28 |
| Undesirable alternatives | 24 |
| Undesirable auditorium effect | 29 |
| Undesirable casino companion | 28 |
| Undesirable coastal phenomena | 29 |
| Undesirable consequences | 24 |
| Undesirable engine sound | 24 |
| Undesirable family member | 25 |
| Undesirable part of a record | 28 |
| Undesirable payment status | 26 |
| Undesirable tank level | 22 |
| Undesirable wing coating | 24 |
| Undesired audience reaction | 27 |
| Undeveloped cotton pod | 22 |
| Undeveloped fingerprints | 24 |
| Undid, as an amendment | 22 |
| Undignified command to Fido | 27 |
| Undiluted breakfast drink | 25 |
| Undiluted, as a bar drink | 25 |
| Undiluted, in a whiskey order | 29 |
| Undistinguished emulator | 24 |
| Undistinguished imitator | 24 |
| Undistinguished poet Pound? | 27 |
| Undiversified, as a farm | 24 |
| Undivided, as attention | 23 |
| Undo one's knitting | 23 |
| Undo's menu header | 22 |
| Undoes, as an amendment | 23 |
| Undomesticated, as cats | 23 |
| Undress with one's eyes | 27 |
| Undressed, redundantly | 22 |
| Undrinkable type of cocktail | 28 |
| Undulation in the stands | 24 |
| Unduly high appraisals | 22 |
| Unduplicatable, in a way | 24 |
| Undying belief in jewelry? | 26 |
| Une jeune fille (abbr) | 22 |
| Une ___ (1 a.m., in Paris) | 26 |
| Unearth "___ Dry" | 27 |
| Unearth, with "up" | 28 |
| Uneasy about a long shot? | 25 |
| Uneasy around strangers | 23 |
| Uneasy feeling in the stomach | 29 |
| Uneasy, eerie sensation | 23 |
| Uneaten part of an apple | 24 |
| Uneconomical car, perhaps | 25 |
| Unelected political bigwig | 26 |
| Unemotional to a fault | 22 |
| Unemotional type, slangily | 26 |
| Unemotional woman, in slang | 27 |
| Unemotional woman, slangily | 27 |
| Unemployment Insurance org. | 27 |
| Unemployment office sight | 25 |
| Unemployment rate, e.g. | 23 |
| Unemployment, in a phrase | 25 |
| Unengaging speaking voice | 25 |
| Unenthusiastic agreement | 24 |
| Unenthusiastic endorsement | 26 |
| Unenthusiastic response | 23 |
| Unenthusiastic responses | 24 |
| Unenthusiastic reviews | 22 |
| Unenthusiastic to the max | 25 |
| Unenthusiastic, as a response | 29 |
| Unenviable obligations | 22 |
| Unequal on all three sides | 26 |
| Unequivocal rejections | 22 |
| Unesco Building muralist | 24 |
| Unethical way to make money | 27 |
| Uneven, as a leaf edge | 22 |
| Uneven, as a leaf's edge | 28 |
| Uneven, as a paint job | 22 |
| Uneven, as a performance | 24 |
| Uneven, as if gnawed away | 25 |
| Unevenly notched, as a leaf | 27 |
| Unevenly notched, as leaves | 27 |
| Unexciting bridge holdings | 26 |
| Unexciting end of play | 22 |
| Unexciting movie trailer? | 25 |
| Unexciting party guest | 22 |