| Uckle | v | Cover |
| Udder-Ill | n | Ailment of cows |
| Um | pron | Them |
| Umber | n | Number |
| Umbessy | n | Etcetera |
| Umbethink | v | Recollect |
| Ummit | n | Piece, large |
| Umpsouze | n | Almshouse |
| Unaccountable | adj | Dementing |
| Unbark | v | Disembark |
| Unbelieving | adj | Disobedient (of child) |
| Unbemeaning-Like | adv | Unintentionally |
| Unbutton | v | Open (eyes or ears) |
| Unchoke | v | Unblock |
| Uncle | n | Term of respect for elderly man |
| Uncontented | adj | Discontented |
| Unconvenient | adj | Inconvenient |
| Undecent | adj | Indecent |
| Undercumstumble | v | Understand |
| Underground | adj | Dumpy |
| Underground Shepherd | n | Early Purple Orchis |
| Underman | v | Demean |
| Underminded | adj | Treacherous |
| Undone | adj | Distressed |
| Uneasy | adj | Difficult |
| Uneave | v | Thaw |
| Unempt | v | Unload |
| Unent | v | Empty |
| Unfriend | n | Enemy |
| Unhandy | adj | Incapable |
| Unhasp | n | Unfasten |
| Unheal | v | Uncover |
| Unhonest | adj | Dishonest |
| Unicorn Team | n | Team with one in front and two abreast |
| Unkind | adj | Uncongenial (of soil) |
| Unkindly | adj | Unnatural |
| Unknowing | adj | Unknown |
| Unlifty | adj | Unweildy |
| Unlight | v | Alight |
| Unmerciful | adj | Excessive |
| Unneath | prep | Beneath |
| Unpassable | adj | Impassable |
| Unpeaceable | adj | Irritable |
| Unperfect | adj | Imperfect |
| Unpower | n | Helplessness |
| Unproper | adj | Improper |
| Unrag | v | Undress |
| Unray | v | Undress |
| Unready | adj | Untidy |
| Unreave | v | Unravel |
| Unregular | adj | Irregular |
| Unrind | v | Undress |
| Unrip | v | Rip |
| Unsooterly | adj | Awkward |
| Unstinted | n | Unrestrained |
| Unstomachable | adj | Unappetizing |
| Unsuity | adj | Irregular |
| Untackle | v | Unharness |
| Untang | v | Untie |
| Unthaw | v | Thaw |
| Until | prep | Before |
| Unvitty | adj | Unft |
| Unyoke in the Sherd | v | Leave at a critical time |
| Upazet | adj | Opposite |
| Upping-Block | n | Horse-Block |
| Uppings | n | Prerequisites |
| Uppish | adj | Peevish |
| Upsetting | n | Quarrel |
| Upshard | n | Stopgap |
| Upshot | n | Reckoning |
| Upsome | adj | Contrarian |
| Upstairs | adv | Bed-Ridden |
| Upstart | v | Rear up |
| Urge | v | Retch |
| Us's | pron | Our |
| Usement | n | Custom |
| Usen | v | Accustom |
| Usens | n | Manger |
| Ussels | pron | Ourselves |
| Utick | n | Whinchat |