| unmalleability | (noun) a lack of malleability | - |
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| unmanageableness | (noun) the trait of being unmanageable | Synonyms: recalcitrance, recalcitrancy, refractoriness |
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| unmanliness | (noun) the trait of being effeminate (derogatory of a man) | Synonyms: effeminacy, effeminateness, sissiness, softness, womanishness |
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| unmasking | (noun) the exposure of an impostor or a fraud | Synonyms: expose |
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| unmentionable | (noun) a garment worn under other garments | Synonyms: undergarment |
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| unmercifulness | (noun) inhumaneness evidenced by an unwillingness to be kind or forgiving | Synonyms: mercilessness |
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| unmindfulness | (noun) the trait of forgetting or ignoring your responsibilities | Synonyms: heedlessness, inadvertence, inadvertency |
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| unmusicality | (noun) The state or condition of being lacking in musical ability. | - |
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