| Understates | 11 |
| Understood | 10 |
| Understood in radio | 20 |
| Understood a joke | 17 |
| Understood archaeology? | 23 |
| Understood archeology? | 22 |
| Understood by a select few | 26 |
| Understood by few | 17 |
| Understood by only a few | 24 |
| Understood by very few | 22 |
| Understood finally | 18 |
| Understood one did wrong | 24 |
| Understood what one did wrong | 29 |
| Understood without being stated | 31 |
| Understood, as a joke | 21 |
| Understood, as a punch line | 27 |
| Understood, slangily | 20 |
| Understood: Colloq. | 19 |
| Understudies for a star of "The Piano"? | 49 |
| Understudies for the Rockettes? | 31 |
| Understudy | 10 |
| Understudy in a Broadway show? | 30 |
| Understudy's crime? | 23 |
| Understudy's dream | 22 |
| Understudy's study | 22 |
| Undersupplied | 13 |
| Undersurface | 12 |
| Undersurfaces | 13 |
| Undertake | 9 |
| Undertake halfheartedly | 23 |
| Undertake legal recourse | 24 |
| Undertake precipitately | 23 |
| Undertake, as responsibilities | 30 |
| Undertake, with "out" | 31 |
| Undertaker's purchase | 25 |
| Undertaker, usually | 19 |
| Undertakers | 11 |
| Undertakes | 10 |
| Undertakes without permission | 29 |
| Undertakes, as risk | 19 |
| Undertaking | 11 |
| Undertaking, in Britain | 23 |
| Undertakings | 12 |
| Underthing that's part of a bleeped phrase? | 47 |
| Undertone | 9 |
| Undertones | 10 |
| Undertook | 9 |
| Undertow single | 15 |
| Underutilize | 12 |
| Undervalue. | 11 |
| Undervalued | 11 |
| Underwater "wolf pack" | 32 |
| Underwater acronym | 18 |
| Underwater activity | 19 |
| Underwater apparatus | 20 |
| Underwater army dangers? | 24 |
| Underwater beeper | 17 |
| Underwater bloodsucker | 22 |
| Underwater breather | 19 |
| Underwater breathing aid | 24 |
| Underwater breathing aids | 25 |
| Underwater breathing apparatus | 30 |
| Underwater breathing apparatus? | 31 |
| Underwater breathing gear | 25 |
| Underwater breathing organs | 27 |
| Underwater cave dweller | 23 |
| Underwater concrete depositor | 29 |
| Underwater craft | 16 |
| Underwater craft, briefly | 25 |
| Underwater creature whose males give birth | 42 |
| Underwater current generator | 28 |
| Underwater deposit | 18 |
| Underwater detection device | 27 |
| Underwater detection instruments | 32 |
| Underwater detection system | 27 |
| Underwater detection systems | 28 |
| Underwater detection technique | 30 |
| Underwater detector | 19 |
| Underwater detector? | 20 |
| Underwater directors | 20 |
| Underwater eggs | 15 |
| Underwater electricity source | 29 |
| Underwater England/France connection | 36 |
| Underwater entertainment? | 25 |
| Underwater escape mechanism | 27 |
| Underwater excavation machine | 29 |
| Underwater experiment site | 26 |
| Underwater explorer | 19 |
| Underwater explosive | 20 |
| Underwater families | 19 |
| Underwater films? | 17 |
| Underwater finder | 17 |
| Underwater fisherman | 20 |
| Underwater fishing aid | 22 |
| Underwater forest plant | 23 |
| Underwater gear | 15 |
| Underwater growth | 17 |
| Underwater growths | 18 |
| Underwater habitat | 18 |
| Underwater hazard | 17 |