| unstoppable | incontrolable |
| Unstructured Supplementary Service Data | USSD |
| Unstrut | Río Unstrut |
| Unstrut-Hainich | Unstrut-Hainich-Kreis |
| unstuck | despegado |
| unstudied | natural |
| unsubtle | grosero |
| unsuccessful | frustrado |
| unsugared | no azucarado |
| unsuitable | inapropiado |
| unsupported | sin fundamento |
| unsure | inseguro |
| unsureness | inseguridad |
| Unsuri | Unsuri |
| unsurmountable | invencible |
| unsurpassable | insuperable |
| unsurpassed | sin precedentes |
| unsuspected | insospechado |
| unsuspecting | poco suspicaz |
| unsuspectingly | desprevenido |
| unswerving | firme |
| unsympathetic | antipático |
| untainted | impoluto |
| untameable | indómito |
| untamed | indomado |
| untangle | desenredar |
| untapped | sin explotar |
| untaught | sin instrucción |
| Unten downright | Derecha política |
| untenable | insostenible |
| Unter den Linden | Unter den Linden |
| Unterbäch | Unterbäch |
| Untereggen | Untereggen |
| Unterems | Unterems |
| Unterentfelden | Unterentfelden |
| Unterhaching | SpVgg Unterhaching |
| Unteriberg | Unteriberg |
| Unterlangenegg | Unterlangenegg |
| Unterlinden Museum | Museo de Unterlinden |
| Unterramsern | Unterramsern |
| Unterscharführer | Unterscharführer |
| Unterschächen | Unterschächen |
| Unterseen | Unterseen |
| Untersteckholz | Untersteckholz |
| Untervaz | Untervaz |
| Unterwalden | Unterwalden |
| Unterägeri | Unterägeri |
| unthankful | desagradecido |
| unthinkable | inconcebible |
| unthinking | atolondrado |
| unthinkingly | a ciegas |
| unthought | desaconsejado |
| unthoughtful | desconsiderado |
| unthriftily | gastoso |
| untidily | desarreglado |
| untidiness | desorden |
| untidy | descuidado |
| untie | desatar |
