| unassailable | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unshakable, watertight |
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| (adjective) impossible to assail | Synonyms: untouchable |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, secure, strong, unattackable |
| uncompensated | (adjective) not paying a salary | Synonyms: unsalaried |
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| undecomposable | (adjective) representing the furthest possible extent of analysis or division into parts | Synonyms: unanalyzable |
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| undiagnosable | (adjective) not possible to diagnose | - |
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| unerasable | (adjective) cannot be removed or erased | Synonyms: indelible |
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| universal | (adjective) adapted to various purposes, sizes, forms, operations | - |
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| (adjective) of worldwide scope or applicability | Synonyms: cosmopolitan, ecumenical, general, oecumenical, world-wide, worldwide |
| (adjective) applicable to or common to all members of a group or set | - |
| universalist | (adjective) of or relating to or tending toward universalism | Synonyms: universalistic |
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| universalistic | (adjective) of or relating to or tending toward universalism | Synonyms: universalist |
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| (adjective) of or relating to the whole | - |
| unnecessary | (adjective) not necessary | Synonyms: unneeded |
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| unopposable | (adjective) not opposable | - |
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| unpassable | (adjective) incapable of being passed | Synonyms: impassable |
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| unpleasant | (adjective) offensive or disagreeable; causing discomfort or unhappiness | - |
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| unrecognisable | (adjective) defying recognition as e.g. because of damage or alteration | Synonyms: unrecognizable |
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| unsaddled | (adjective) with no saddle | - |
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| unsafe | (adjective) involving or causing danger or risk; liable to hurt or harm | Synonyms: dangerous |
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| (adjective) lacking in security or safety | Synonyms: insecure |
| (adjective) not safe from attack | Synonyms: insecure |
| unsaid | (adjective) not made explicit | Synonyms: unexpressed, unspoken, unstated, unuttered, unverbalised, unverbalized, unvoiced |
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| unsalable | (adjective) impossible to sell | Synonyms: unsaleable |
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| unsalaried | (adjective) not paying a salary | Synonyms: uncompensated |
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| unsaleable | (adjective) impossible to sell | Synonyms: unsalable |
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| unsalted | (adjective) without salt or seasoning | Synonyms: unseasoned |
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| unsanctified | (adjective) not holy because unconsecrated or impure or defiled | Synonyms: profane, unconsecrated |
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| unsanctioned | (adjective) without explicit official permission | - |
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| unsanded | (adjective) used of wood and furniture | Synonyms: raw |
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| unsanitary | (adjective) not sanitary or healthful | Synonyms: insanitary, unhealthful |
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| unsaponified | (adjective) not converted into soap | - |
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| unsarcastic | (adjective) not sarcastic | - |
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| unsated | (adjective) not having been satisfied | Synonyms: unsatiated, unsatisfied |
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| unsatiable | (adjective) impossible to satisfy | Synonyms: insatiable, insatiate |
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| unsatiated | (adjective) not having been satisfied | Synonyms: unsated, unsatisfied |
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| unsatisfactory | (adjective) not giving satisfaction | - |
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| unsatisfiable | (adjective) not capable of being satisfied | - |
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| unsatisfied | (adjective) worried and uneasy | Synonyms: restless, ungratified |
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| (adjective) not having been satisfied | Synonyms: unsated, unsatiated |
| unsatisfying | (adjective) not up to expectations | Synonyms: disappointing, dissatisfactory |
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| unsaturated | (adjective) used of a compound (especially of carbon) containing atoms sharing more than one valence bond | - |
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| (adjective) not saturated; capable of dissolving more of a substance at a given temperature | - |
| (adjective) (of color) not chromatically pure; diluted | - |
| unsaved | (adjective) in danger of the eternal punishment of Hell | Synonyms: cursed, damned, doomed, unredeemed |
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| unsavory | (adjective) morally offensive | Synonyms: offensive, unsavoury |
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| (adjective) not pleasing in odor or taste | Synonyms: distasteful, unsavoury |
| unsavoury | (adjective) morally offensive | Synonyms: offensive, unsavory |
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| (adjective) not pleasing in odor or taste | Synonyms: distasteful, unsavory |
| unsensational | (adjective) not of such character as to arouse intense interest, curiosity, or emotional reaction | - |
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| unsurpassable | (adjective) not to be exceeded | - |
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| untraversable | (adjective) incapable of being traversed | - |
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| unusable | (adjective) not capable of being used | Synonyms: unserviceable, unuseable |
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| usable | (adjective) convenient for use or disposal | Synonyms: available, useable |
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| (adjective) fit or ready for use or service | Synonyms: functional, operable, operational, useable |
| (adjective) capable of being put to use | Synonyms: useable |
| vapourisable | (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vaporizable, vapourific, volatilisable, volatilizable |
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| versatile | (adjective) able to move freely in all directions | - |
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| (adjective) competent in many areas and able to turn with ease from one thing to another | - |
| (adjective) changeable or inconstant | - |
| (adjective) having great diversity or variety | Synonyms: various |
| visaged | (adjective) having a face or visage as specified | - |
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| volatilisable | (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vaporizable, vapourific, vapourisable, volatilizable |
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| wholesale | (adjective) ignoring distinctions | Synonyms: sweeping |
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