| Text | Length |
| Unknown author (Abbr.) | 22 |
| Unknown author's byline | 27 |
| Unknown author's byline, briefly | 36 |
| Unknown author, briefly | 23 |
| Unknown author, for short | 25 |
| Unknown author: Abbr. | 21 |
| Unknown conditions | 18 |
| Unknown defendant | 17 |
| Unknown degree | 14 |
| Unknown element | 15 |
| Unknown factors | 15 |
| Unknown higher power? | 21 |
| Unknown Jane | 12 |
| Unknown John | 12 |
| Unknown John or Jane | 20 |
| Unknown litigant | 16 |
| Unknown man | 11 |
| Unknown name | 12 |
| Unknown ones, briefly | 21 |
| Unknown ordinal | 15 |
| Unknown people | 14 |
| Unknown person | 14 |
| Unknown place | 13 |
| Unknown power | 13 |
| Unknown power? | 14 |
| Unknown quantity | 16 |
| Unknown quote source, for short | 31 |
| Unknown Richard | 15 |
| Unknown Soldier's landmark | 30 |
| Unknown Soldier's place | 27 |
| Unknown time letters | 20 |
| Unknown to many | 15 |
| Unknown woman | 13 |
| Unknown women | 13 |
| Unknown writer (Abbr.) | 22 |
| Unknown, as a writer: Abbr. | 27 |
| Unknown, on a sched. | 20 |
| Unknown, on a TV sched. | 23 |
| Unknown: Abbr. | 14 |
| Unknowns | 8 |
| Unknowns in algebra | 19 |
| Unknowns to figure out | 22 |
| Unkosher | 8 |
| Unkosher deli orders | 20 |
| Unlace, perhaps | 15 |
| Unladen truck weight | 20 |
| Unladen weight | 14 |
| Unlaid lawn | 11 |
| Unlatch, in poems | 17 |
| Unlatch, poetically | 19 |
| Unlatch, to bards | 17 |
| Unlatches a door, in poesy | 26 |
| Unlatches, in verse | 19 |
| Unlawful | 8 |
| Unlawful acquisition | 20 |
| Unlawful act | 12 |
| Unlawful activity | 17 |
| Unlawful assembly | 17 |
| Unlawful constraint | 19 |
| Unlawful entry | 14 |
| Unlawful fire | 13 |
| Unlawful fire-starting | 22 |
| Unlawful firing | 15 |
| Unlawful firing? | 16 |
| Unlawful opportunist | 20 |
| Unlawful rate of interest | 25 |
| Unlawful takings | 16 |
| Unlawful to-dos | 15 |
| Unlawful, in Iberia | 19 |
| Unlawfully distilled whiskey | 28 |
| Unlawfully loud sound | 21 |
| Unleaded alt. | 13 |
| Unleaded fuel | 13 |
| Unlearned | 9 |
| Unleash | 7 |
| Unleash "anyone lived in a pretty how town" poet? | 59 |
| Unleash a diatribe | 18 |
| Unleash pent-up emotions | 24 |
| Unleash upon | 12 |
| Unleash, as havoc | 17 |
| Unleash, as mayhem | 18 |
| Unleashed | 9 |
| Unleashed, as a trap | 20 |
| Unleashes | 9 |
| Unleashes (on) | 14 |
| Unleashes (upon) | 16 |
| Unleashes on | 12 |
| Unleashes the waterworks | 24 |
| Unleashes, as the hounds | 24 |
| Unleavened bread | 16 |
| Unleavened breads | 17 |
| Unleisurely | 11 |
| Unless (Lat.) | 13 |
| Unless (Latin) | 14 |
| Unless before: Lat. abbr. | 25 |
| Unless unwarranted | 18 |
| Unless, in court | 16 |
| Unless, in decrees | 18 |
| Unless, in law | 14 |
| Unless, legally | 15 |
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