| unabashed | descarado |
| unabashedly | desinhibidamente |
| unabated | no disminuido |
| unabating | incesante |
| unable | impotente |
| unable to work | incapacitado |
| unabridged | íntegro |
| unacceptable | impugnable |
| unacceptable actions | exceso |
| unacceptably | inaceptablemente |
| unaccommodating | poco complaciente |
| unaccompanied | solo |
| unaccountable | inexplicable |
| unaccountably | inexplicablemente |
| unaccustomed | desacostumbrado |
| unaccustomed to | desacostumbrado a |
| unachievable | inalcanzable |
| unaddressed | sin dirección |
| unadulterate | puro |
| unadulterated | puro |
| unadvisable | no aconsejable |
| unadvised | imprudente |
| unaffected | natural |
| unafraid | impertérrito |
| Unagisaki hocho | Unagisaki hocho |
| Unai Etxebarria | Unai Etxebarria |
| Unai Expósito | Unai Expósito Medina |
| Unai Expósito Medina | Unai Expósito Medina |
| Unai Osa | Unai Osa |
| unaided | sin ayuda |
| Unalaska Island | Unalaska |
| unalloyed | sin aleación |
| unaltered | inalterado |
| unambiguous | inequívoco |
| unambiguously | inequívocamente |
| unanimity | unanimidad |
| unanimous | unánime |
| unanimously | unánimemente |
| unannounced | sin ser anunciado |
| unanswerable | sin respuesta |
| unanswered | por contestar |
| unappreciated | no apreciado |
| unapproachable | inaccesible |
| unarguable | incontestable |
| unarguably | irrefutablemente |
| unarm | desarmar |
| unarmed | desarmado |
| unasked | no solicitado |
| unassailable | inexpugnable |
| unassisted | sin ayuda |
| unassuming | humilde |
| unattached | libre |
| unattainable | inasequible |
| unattended | desatendido |
| unattractive | poco atractivo |
| unauthorized | no autorizado |
| unavailable | agotado |
| unavailing | fútil |
| unavoidable | inevitable |
| unavoidably | inevitablemente |
| unaware | inconsciente |
| unaware of | inconsciente de |
| unawares | de improviso |
| unbalance | desequilibrar |
| unbalanced | trastornado |
| unbar | abrir |
| unbearable | atroz |
| unbeatable | invencible |
| unbeknown to somebody | sin saberlo alguien |
| unbeknownst | desconocido |
| unbeknownst to somebody | sin saberlo alguien |
| unbelief | escepticismo |
| unbelievable | estupendo |
| unbelievably | increíblemente |
| unbeliever | incrédulo |
| unbelieving | dudoso |
| unbending | obstinado |
| unbiased | objetivo |
| unbiasedly | desaprensivo |
| unbibium | unbibio |
| unbiblical | anti-bíblico |
| unbind | desatar |
| unbinilium | unbinilio |
| unbiunium | unbiunio |
| unblemished | puro |
| unblushing | desvergonzado |
| unblushingly | desvergonzadamente |
| unborn | nonato |
| Unborn child | Nasciturus |
| unbosom | confesar |
| Unbosom oneself | Espontanearse |
| unbounded | ilimitado |
| unbreakable | indisoluble |
| unbridled | sedicioso |
| unbroken | irrompible |
| Unbrokenness | Medicina holística |
| unbuckle | desabrochar |
| unburden | descargar |
| unbutton | desabotonar |
| UNCAF Nations Cup | Copa de Naciones de la UNCAF |
| uncalled-for | innecesario |
| uncannily | misteriosamente |
| uncanny | misterioso |
| Uncaria tomentosa | Uncaria tomentosa |
| uncaring | insensible |
| unceasing | continuo |
| uncensored | entero |
| unceremonious | sin ceremonia |
| uncertain | variable |
